Good evening! Thank you very much for joining Sports Mole for tonight's FA Cup clash between West Ham United and Liverpool. The fifth round, and a match against Championship side Blackburn Rovers, awaits the winners of tonight's replay on what will be Liverpool's last ever visit to the Boleyn Ground. Let's start things off with a look at the two teams...

LIVERPOOL STARTING XI: Mignolet; Flanagan, Lucas, Ilori, Smith; Stewart, Chirivella, Teixeira, Coutinho, Ibe; Benteke

LIVERPOOL SUBS: Ward, Enrique, Milner, Henderson, Sturridge, Origi, Randall

The hosts are being a little sluggish with their team news, so for the time being let's focus on the visitors tonight. With Jurgen Klopp back on the sidelines having had his appendix removed at the weekend, there is also another notable return on the field as Philippe Coutinho is handed a start. The Brazilian has been sidelined through injury since the first leg of the League Cup semi-final against Stoke last month, but is thrown straight in from the start tonight - a big boost for the Reds.

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He is one of a number of changes to the starting XI, and it doesn't exactly come as a surprise that Klopp has brought in so many new faces once again. Just like in the initial tie, Liverpool make 10 changes to the side that drew with Sunderland at the weekend, with Simon Mignolet in goal the only player to keep his place in the side. Interestingly, Lucas is started at centre-back and there is no Toure or Sakho in the squad, with Lovren and Skrtel currently struggling with injuries.

Also in defence is Jon Flanagan, making just his second start since returning from injury. He played 105 minutes on his first start - the League Cup semi-final against Stoke - and there is the prospect of this one going to extra time too, so it will be interesting to see how long he lasts should that happen. Ilori gets a rare start at the heart of the defence alongside Lucas, while Smith is once again named at left-back for a cup game.

It is a very youthful midfield named by Klopp too, with Stewart, Chirivella and Teixeira all included tonight, while the likes of Milner and Henderson sit on the bench. Ibe also still comes under the category of youngster, but he has more first-team experience that the aforementioned players and made a difference for Liverpool against Sunderland when he came off the bench at the weekend. Leading the line is Benteke once again, with the Belgian being limited to cup games when it comes to starting matches now. Sturridge, meanwhile, is on the bench having been an unused sub at the weekend.

WEST HAM STARTING XI: Randolph; O'Brien, Reid, Ogbonna, Cresswell; Noble, Obiang, Antonio, Kouyate, Payet; Valencia

WEST HAM SUBS: Adrian, Carroll, Collins, Moses, Oxford, Cullen, Parfitt-Williams

As for the Hammers, much like the initial tie at Anfield, they don't make quite as many changes as Liverpool, but there are a few first-team players left out of the starting lineup. That begins in goal, where Randolph is once again preferred to Adrian for the cup having helped his side come away from Anfield with a goalless draw at the end of last month.

In defence there are two changes from the side that lost to Southampton last time out, and Ogbonna replacing Collins alongside Reid in the middle and O'Brien being handed his first start since July at right-back, where the Hammers are struggling tonight. Byram is cup-tied and so unavailable, while Tomkins has picked up a calf problem and Jenkinson is out for the season. Cresswell will start on the opposite flank, just like at the weekend.

In addition to those three changes in goal and defence, Slaven Bilic has made two more in midfield as both Song and Moses drop out of the side, with the latter making do with a place on the bench tonight. Obiang and Kouyate come into the starting XI in their place, joining Noble, Antonio and Payet in giving support for the lone striker this evening.

Bilic will be looking to Payet in particular to provide the creative spark for his side tonight, and the playmaker has certainly shown that he is capable of it already this season. He was rather subdued in the initial tie, and in the weekend defeat to Southampton, but when on form there is little defenders can do to stop him. He will be the main support for Valencia, who leads the line once again. Andy Carroll, a former Liverpool player and goalscorer the last time the Reds visited Upton Park, is on the bench following a recent injury.

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West Ham's starting XI is certainly closer to their first-choice side than that of Liverpool, then, and that will reinforce them as favourites for this match in the minds of many. They sit four points clear of tonight's opponents in the Premier League table and have shown that they are capable of picking up big results against the biggest teams, and they will certainly fancy their chances of making it through to the fifth round this evening.

Having said that, their recent form has not been the best. On the whole, Bilic has impressed since taking over last summer, but they come into tonight's match having only won one of their last five games in all competitions - and that against a 10-man Aston Villa. It is a period of inconsistency that follows a run of four straight victories, and Bilic will be eager to get back to those winning ways as soon as possible.

Despite the recent blip, West Ham are still very much in the mix when it comes to a European place this season, and that would be a perfect way for them to mark their first campaign at the Olympic Stadium next term. They currently sit sixth in the Premier League table, just two points off Manchester United in fifth. The top four may be beyond them - the gap to fourth is now eight points - but the Europa League is a very real possibility.

Inconsistency has been an issue for both of these sides this season, but West Ham have at least been able to avoid regularly losing matches. Indeed, they have not lost consecutive games in all competitions since August, when they were beaten by Leicester and Bournemouth in succession. Defeat tonight would see them lose two in a row following the 1-0 reverse at Southampton on Saturday, and they don't often respond well to defeat - every single one since the Bournemouth loss has been followed by a draw, rather than a win.

That Bournemouth defeat, which came by the odd goal in a seven-goal thriller, is also the last time they West Ham were beaten at Upton Park, going 11 matches without defeat in front of their own fans since. At the start of the campaign it was all about their away form, with successive wins at Arsenal, Liverpool and Manchester City, but they have marked their final season here with some good form since August. That has improved even further in recent weeks, with four wins from their last five games here.

They haven't been beaten here in the FA Cup since January 2010, when they were beaten 2-1 by Arsenal - a run of six games in which they have won five and drawn one. That loss to the Gunners is their only home FA Cup defeat in their last 10 too, a run that stretches back more than nine years to January 2007. That includes their 1-0 victory over Wolves in the third round of this season, when Nikica Jelavic got the only goal of the game late on.

Before that victory over Wolves, West Ham had only won one of their previous nine FA Cup games excluding penalties, and that was only a narrow triumph over Bristol City. They haven't beaten a top-flight team in this competition since their run to the final in 2006, when of course they were beaten by Liverpool at the Millennium Stadium.

Rarely would they have gone into an FA Cup game against fellow top-flight opposition in such good shape themselves, however, while the reverse could perhaps be said of Liverpool. The Reds don't seem to be making much progress at all this season, with every perceived step forward being quickly followed by two steps back. They come into this match sitting a lowly ninth in the Premier League, 12 points off the top four and a full 18 off leaders Leicester.

The gap to the Champions League places doesn't quite yet fall into the realms of unassailable, but it would require a huge upturn in form for Liverpool to put any pressure on the top four. That is unlikely considering how they have played all season, so the priorities may instead switch to cup competitions. They have reached the final of the League Cup and remain in the Europa League - which could of course still provide a route into the Champions League. Progress in the FA Cup would also help to turn Liverpool's campaign from a poor one into one that at least yielded some joy and perhaps silverware.

The fact of the matter so far, however, is that Jurgen Klopp has shown no great improvement since succeeding Brendan Rodgers in the role. Under the German, Liverpool have won 12 games, drawn nine and lost seven in all competitions, which is far too inconsistent to seriously push for the Champions League, and is also not exactly conducive to good cup runs either. They are yet to win consecutive matches in 2016, although like West Ham they have also not lost consecutive games since the opening months of the season.

Their Premier League record says it all, though - nine wins, eight draws and eight defeats. It is impossible to predict which Liverpool will turn up - the side that blew the likes of Man City and Southampton away, hit five past Norwich but then conceded four at the other end too, or the side that often doesn't look like scoring if they were to play for a week. Certain areas definitely need improving, though. Liverpool have the worst defensive record outside the bottom six in the league, while no team in the top nine has scored fewer.

They appeared to be on course for a return to winning ways at the weekend, leading struggling Sunderland by two goals going into the final 10 minutes at Anfield. A fan walkout in protest against rising ticket prices had left the Kop almost empty while the Reds collapse in the closing stages, with goals from Adam Johnson and Jermain Defoe rescuing a point for the Black Cats. Squandering what was a very comfortable lead against a side so low in the table, with such little time on the clock, is inexcusable and exactly the reason why Liverpool find themselves down in ninth now.

The Reds have actually amassed more points on the road than they have at Anfield this season, but they aren't in the best of form on their travels at the moment. They have only won three of their last nine away games in all competitions, failing to even score in five of those. They have only lost one of their last six FA Cup away games, though, and have scored in each of their last 11 - a run that stretches back more than five years.

Home and away, the Reds have lost just one of their last 10 FA Cup games, with that coming in last season's semi-final against Aston Villa. They have, however, needed replays on four occasions in the last seven rounds, including this evening and the third round this year. They were held to a 2-2 draw by League Two side Exeter City at St James' Park, before their class told in the return match with a 3-0 victory at Anfield.

PREDICTION: We're 10 minutes away from kickoff at Upton Park, which means that it is time for a prediction! Both sides have been inconsistent of late, which makes this game an incredibly difficult one to call. Liverpool's weakened starting XI could just give the hosts an edge, though, and while it may go all the way to extra time and penalties, I'm predicting West Ham to make it through to the fifth round.

This is the fourth time that these two sides have played this season, with West Ham unbeaten up to this point. They did the league double over the Reds for the first time in 52 years, winning 3-0 at Anfield and 2-0 here just last month, with goals from Antonio and Carroll. Their victory at Anfield in August was their first there since 1963, and more recently they came away with the goalless draw that forced tonight's replay.

That means that Liverpool have failed to score in 270 minutes of action against the Hammers this season, while West Ham are tonight bidding to keep four clean sheets against Liverpool in the same season for the first time ever. Liverpool have not exactly looked dangerous going forward since their 5-4 win over Norwich, so there is every chance that the hosts might pick up another clean sheet tonight.

However, the Hammers have never before beaten Liverpool in the FA Cup, losing four and drawing three of their seven meetings. The most recent before the goalless draw this season was the memorable 2006 final, when Steven Gerrard inspired the Reds to victory via penalties. That was the seventh and most recent time that Liverpool lifted the famous old trophy, while it was also the last time that West Ham got to the final. They have three FA Cups to their name down the years, but the last of those came in 1980.

We're almost ready to go at Upton Park now! A reminder that the winning of this tie - and we will definitely get one tonight - will take on Blackburn Rovers in the fifth round on Sunday, February 21.

KICKOFF: Here we go then! West Ham get us underway for this FA Cup replay as they look to book their place in the fifth round at the expense of Liverpool.

Liverpool have seen a decent amount of the ball in these opening exchanges as they look to make an early impact with their youthful side. Nothing to worry Randolph in the West Ham goal so far, though.

Good run from Smith down the left as he is found overlapping in space. He lifts a cross into the box towards Ibe, but Cresswell gets just enough on the ball to steer it away from the winger.

Klopp is staying firmly in his seat so far, having to rein himself in due to his recent surgery. He will be pleased with that he has seen from his side so far though - they have enjoyed 71% of the ball and have settled very quickly here.

No chances to shout about in this opening 10 minutes or so, but Liverpool are looking the more confident of the two sides in possession. West Ham are yet to really string a good run of passes together.

A ball is floated over the top towards Antonio down the right channel, but he seems more concerned with Smith close to him and can't keep the ball in.

Really good run from Ibe to take the ball out of defence and into midfield, before he gets support and eventually Liverpool are able to win a corner out of it.

The ball is swung in to Benteke, who nods it back into a dangerous area. Teixeira tries to flick it in but can't connect, and a scramble ensues before Randolph is able to concede another corner.

CHANCE! That second corner provides the first chance of the match, with the ball once again being delivered deep to the back post. Benteke is there and able to volley it towards goal from a tight angle, but Randolph is there to make the save.

OFF THE POST! At the other end West Ham suddenly burst into life and are inches away from breaking the deadlock! Payet plays the ball out right, where O'Brien is in too much space having surged up from the back. He drives one low towards goal and it takes a big deflection off Lucas before thumping against the post.

It was a pretty slow start to this match, but it has begun to heat up a little in the last couple of minutes with those chances at either end. The fans are responding in kind by raising the volume levels inside Upton Park.

West Ham have settled into this match now, seeing more of the ball and preventing Liverpool from stringing any moves together now.

Smith concedes a free kick just inside his own half for a handball, and the delivery from Payet is a testing one. He drops it in to a dangerous area and in the end Liverpool need to concede a corner, which comes to nothing.

Decent spell of possession for Liverpool, although it is all coming in front of the West Ham defence.

CHANCE! Decent move from Liverpool down to the left flank, with Smith underlapping his winger and collecting the ball inside the box. He pulls it back from the byline and it reaches Ibe, but his touch lets him down and the chance goes begging.

YELLOW CARD! Stewart becomes the first name in the book this evening for clattering into Kouyate in a 50-50 challenge.

A number of fouls are disrupting the flow of this match at the moment. There have been a few relatively minor fouls which Roger East has blown up for - understandably but perhaps not best for the game.

CHANCE! Big chance for Liverpool just before the half-hour mark! Again it stems from the left flank and the marauding running of Smith, who this time goes on the outside. He pulls another low ball into the box that eventually falls into the path of Teixeira, but he drills his effort narrowly wide.

Benteke makes a run too early and stops it rather than going for the ball from an offside position. He hasn't offered Liverpool enough so far this evening - and in truth that has been the case in the vast majority of his recent performances. It will be interesting to see if and when Klopp turns to Sturridge if things carry on like this.

OFF THE POST! It's Liverpool's turn to hit the post this time! The visitors find themselves in a three-on-two situation, but Coutinho's pass to Benteke is a little heavy to force the striker to the byline. He shows good feet to work space for a pass back inside for Coutinho, who stabs his finish against the near post. Stewart follows up with a shot that deflects behind for a corner.

CHANCE! More problems for West Ham from a set piece, and again it is Benteke at the back post. He peels away from Reid and this time nods it towards goal from an almost identical position to his earlier volley, and the outcome is the same too as Randolph thwarts the Belgian.

Chance for West Ham here as Ibe is penalised for a shove on Kouyate just outside the box. Payet is standing over this one, and it is pretty much perfectly positioned for him...

OFF THE POST! For the THIRD time in this first half, the upright has been struck. It is a fine effort from Payet as he curls the ball over the wall, but his effort hits the woodwork. It bounces back into the middle and Antonio nods it back towards goal, but Mignolet is up in time to punch it away.

The replays actually show that Mignolet got a touch on that free kick to turn it onto the post. He has taken a lot of stick this season, and rightly so on most occasions, but that was a very good stop.

Good work down the right from Valencia as he creates space to cross the ball, but his driven delivery is intercepted and well held by Mignolet.

West Ham take the lead right on the stroke of half time and, just as he did in the Premier League meeting here, it is Michail Antonio who opens the scoring. It is some goal too, with Valencia's cross taking a slight deflection on its way to the far post, where Antonio is unmarked to fire a beauty of a volley into the far corner.

The first half comes to an end at Upton Park, then, and it is West Ham who take the lead into the break courtesy of that late goal at the end of the opening 45. Liverpool had the better of things in that first half, but they have failed to turn that into goals and now need to rectify that in the second half if they are to stay in this competition.

The goal was a superb strike from Michail Antonio as Valencia's delivery from the left looped up to the back post, when Antonio had worked a yard on Smith inside the area. There was still an awful lot for Antonio to do, however, as he planted a brilliant side-footed volley back across goal and into the far corner.

In truth, it was a surprise that the opening goal took that long to arrive, with the woodwork being hit three times before Antonio's strike. West Ham were responsible for two of those, the first coming when Joey O'Brien found himself in space and drilled an effort towards goal from the edge of the area. It took a big deflection off Lucas, which took the ball past Mignolet and against the woodwork. Payet then also hit the post later in the half with a fine free kick that was tipped against the upright by Mignolet.

Sandwiched between those two was Liverpool hitting the post through Coutinho after the Reds had found themselves in a three-on-two situation. Coutinho's pass out to Benteke was a little heavy and sent the striker wide, but he still managed to squeeze a pass back inside for the Brazilian. Coutinho poked it goalwards, but couldn't wrap his foot around it enough to get the ball inside the post.

Most of Liverpool's best moments have come down the left, or from set pieces, which West Ham have struggled to deal with. Benteke has found space inside the box on a few occasions from corners, but each time he has been unable to convert.

KICKOFF: Liverpool get us back underway for this second half as they look drag themselves back into this replay.

Liverpool have a free kick right on the edge of the area here as the ball was played in to Benteke, who twisted and turned on the ball before being felled by Obiang. Coutinho is over this one...

Brilliant from Coutinho, who marks his return to the side with a goal in some style! It was always going to be tough to get it over the wall and back down in time due to how close the free kick was to the edge of the box. Coutinho, then, opts to go beneath the wall, taking advantage of them jumping and rolling it into the net.

What a start to the second half that was for Liverpool, and they have their tails up now. Ibe races forward down the right and tries to drive a powerful cross into the box, but Randolph plucks it out of the air.

Liverpool will be delighted at having pulled a goal back so early in this half, and right now they look the most likely to get another. That was the case for the vast majority of the first half as well, though, so they will know that they need to make the most of this time on top.

Coutinho's goal was a cheeky, ingenious piece of play, but it still has to play second fiddle in this game. Here is Michail Antonio opening the scoring with a brilliant volley:

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CHANCE! Big chance for Liverpool as Benteke survives a handball shout before flicking the ball to Smith on the overlap. He reaches the byline and again plays a cross into the box that is only cleared as far as Benteke in the area. His first shot is blocked by Obiang before eventually being hacked away. It would have been controversial, but that was a very good chance.

CHANCE! A chance for West Ham at the other end as Liverpool fail to deal with a long throw into the box. It falls to Cresswell and his first touch takes him into a very promising position, but he scuffs his effort. Moments later the ball is played high into the box again, and Mignolet makes a mess of coming to claim it before being bailed out by a defender.

LIVERPOOL SUBS: A big moment for both club and player here as Daniel Sturridge finally makes his return from injury. It is a double change from Klopp, with Origi also returning from injury as Teixeira and Coutinho make way.

It is hard to determine exactly where Sturridge is playing right now. He went immediately trotting over to the right, but has since drifted infield and seems to be going wherever he so desires in an attempt to just get on the ball.

Almost another chance for an Antonio header as Reid hooks a high ball up after a free kick had failed to reach its target. Antonio completely misses his attempted volley, but recovers and hoists a testing one into the mixer that is awkward for Mignolet and eventually forces him into conceding a corner.

The corner comes to nothing, but Liverpool immediately break with numbers. Benteke picks the ball up and drives into space before finding Sturridge, but he has just strayed into an offside position and his touch back inside was not the greatest either.

WEST HAM SUB: Big blow for West Ham as Winston Reid limps off with what looks like it could be a hamstring injury. On comes James Collins in his place.

PENALTY SHOUT! Big penalty shout from West Ham as Antonio takes the ball around Smith with a lovely touch before whipping a beauty of a ball into the box. Valencia is attacking it but goes down inside the box, prompting big shouts from the home players and supporters. Roger East says no, but the replay clearly shows a tug back from Ilori. That should have been a penalty!

Slaven Bilic is still not happy with that rejected penalty appeal, and when he sees it again he will be even angrier. Ilori certainly got away with what was a pretty blatant tug.

The fans are growing increasingly frustrated with the officials, here, although this time the linesman gets the right decision eventually. He originally awarded West Ham a corner but, seeing Antonio run back presuming a goal kick, he changes his mind.

There is a lot of concern over Kouyate here, with players racing to his aid and rolling him over as if this one could be serious. Roger East immediately calls the medics on, with Kouyate appearing to have been knocked out following a clash of heads with Flanagan.

Kouyate is up, if a little dazed and confused. The stretcher shouldn't be needed, but it will be interesting to see whether they allow the player to continue here. He is still looking a little shaky.

WEST HAM SUB: The medics sensibly take no risks and Kouyate's game is over as he gets replaced by Andy Carroll.

Sturridge has so far been unable to get himself involved in this game since coming on, nor for that matter has Origi. Their attacking threat hasn't improved much since that double change.

Just as I say that, Origi and Sturridge do link up in the final third, but the latter's through-ball is just too heavy and runs to the keeper.

Another free kick in a very good position for Liverpool here after some lovely footwork from Sturridge. This is arguably in a better position than the one Coutinho scored from. Sturridge and Benteke are over it...

SAVE! It is Benteke who goes for it, firing it over the wall. It is at a nice height for Randolph, though, and the keeper gets across to palm the ball away.

WEST HAM SUB: It has been an injury-plagued season for O'Brien, and he is forced off again here to be replaced by Victor Moses.

CHANCE! Decent opening for the hosts as Origi gives the ball away to Payet, and he floats a cross over the defence towards Valencia. It is not an easy chance, though, and the striker can only loop his header over the crossbar.

It is West Ham who are just asking the main questions right now, with Payet starting to get on the ball a bit. Five minutes to go here, and as things stand it will be extra time on top of that!

SAVE! Brilliant effort from Noble as the ball drops to him around 25 yards from goal and he hits it first time. It is on target, but Mignolet is across in good time to make a routine stop.

YELLOW CARD! Antonio goes into the book for a trip on Origi after the Belgian had spun past him.

Stewart is in a lot of pain here following a crunching challenge in which he was caught right on the ankle. In truth, he is lucky that it isn't more serious - that could have been very nasty. As it is, Stewart looks like he will try to run it off.

There will be a minimum of EIGHT minutes added time at the end of this match! Plenty of time for either side to avoid extra time here!

SAVE! Liverpool go in search of that winner, playing an early free kick to Sturridge, whose low cross is only cleared to the edge of the box. Ibe comes on to it and hits a low striker first time that Randolph parries away.

Both sides are going in search of the win in stoppage time here. West Ham come forward with high balls towards Carroll, and he wins two in quick succession to keep things alive. The second falls to Collins, who hooks an effort into the arms of the keeper.

At the other end the ball drops to Sturridge around 25 yards from goal, but his strike is always rising and goes well over the crossbar.

Moses does well to beat his man down the right and put a cross into the box. It is cleared out but Obiang is first to come on to it, taking a touch before firing an effort wide of the target from outside the box.

It must be said that Liverpool are doing an excellent job of playing as much football as they possibly can this season. Once again they are taken all the way to extra time, just as they were in the semi-finals of the League Cup, to add yet more minutes to their packed schedule. They remain in the FA Cup as things stand, though, with 30 minutes, and perhaps penalties, separating either the Reds or West Ham from the fifth round now.

West Ham took the lead in the final minute of the first half through a stunning Antonio volley, but Liverpool responded right at the start of the second half by levelling things up through Coutinho. The Brazilian lined up a free kick just outside the area, but surprised the Hammers by rolling the ball under the wall and in.

KICKOFF: Liverpool get us underway for the first period of extra time here.

It will be interesting to see whether Liverpool's schedule has any impact on things in extra time here. They have made a number of changes for this match, but a lot of their players are either returning from injury or not used to playing at this level.

Almost a chance for West Ham as Payet gets a bit of space and strides forward before playing a ball through towards Moses. Smith goes to ground but doesn't get the ball, and it needs Ilori to get a foot in.

The resulting corner is cleared as far as Cresswell, but as it drops to him he fires a first-time volley a long way over the crossbar.

SAVE! Mignolet is the first keeper called into action in extra time, at full stretch over to his left to deny Noble after the West Ham skipper had been afforded space outside the box. Good effort, and an equally good save.

CLOSE! Big chance for Liverpool to get a goal! Benteke does well to keep the ball and feed it out wide left. The ball towards Sturridge is met by a West Ham head but only loops up to Benteke, who fires a first-time volley just wide.

CHANCE! It is another huge chance for Liverpool and Benteke, who just can't score at the moment. Sturridge slides a pass through to his strike partner, who finds himself with only the keeper to beat, but he never looks confident and Randolph makes a big save with his feet. Benteke had to score there!

LIVERPOOL SUB: Liverpool make their third and final change, and it is Chirivella who makes way to be replaced by James Milner.

CHANCE! Sturridge brings the ball forward in space, but turns down the chance to shoot and instead tries to feed the ball to Origi, which is cut out. Liverpool get the ball back quickly, though, and a cross arrives from the left which Benteke meets, only to nod the ball well over.

We're still all square at the halfway stage of extra time, then, but quite how I'm not sure. Benteke had a trio of chances in that opening 15 minutes, but squandered all of them when he had to score at least one. We're now just quarter of an hour away from penalties!

KICKOFF: West Ham get us underway for the last time this evening. Can either side grab a winner in the remaining 15 minutes to avoid penalties?

CLOSE! Liverpool are close to getting their second of the game yet again! Sturridge picks the ball up and is allowed to carry it a long way before letting fly from 25 yards, seeing his effort fly narrowly over the crossbar.

More space for Liverpool's attackers here as Sturridge and Benteke combine to feed the ball out to Origi. He slows things down before looking to earn a yard, but the angle is against him and he slices one well off target.

Another shooting opportunity for Benteke, although this one is not as clear as some of his previous chances. He goes for goal from outside the area, but it is always veering away from goal and ends up comfortably wide.

Brilliant defending from Lucas as he spots the danger from a long way off, honing in on Valencia to make a brilliant block after the striker had cut inside. Lucas caught Valencia on the follow-through, though and he needs some treatment here.

As Valencia continues to receive treatment, which will prolong this night even further, Liverpool legend Jamie Carragher has given Lucas his seal of approval:

Couldn't understand Klopp using Lucas at CB in the last few months but looks like he was right! #Colossus — Jamie Carragher (@Carra23) February 9, 2016

Valencia is going to battle on here, limping back onto the field as West Ham have used all of their subs.

Lovely football from Sturridge as he dances past three West Ham defenders before finally being dispossessed as West Ham concede the corner. Sturridge really has looked bright since coming on.

CHANCE! This time it is Milner's turn to dance forward before being tackled. The ball bounces out to the right, where Flanagan is on the overlap. He plays a low ball into the box and Sturridge tries to flick it goalwards, but Collins makes the block.

From the resulting corner Flanagan is left unmarked at the near post, but his attempted flick is cut out and put behind for another corner.

There will be a minimum of two minutes added time in extra time.

Heartbreak for Liverpool late on as West Ham win it in added time of stoppage time! Lucas concedes a free kick in a dangerous position, and Payet's delivery is a good one. Ogbonna climbs highest in the area before planting a form header into the far corner. Surely that is enough to send the Hammers into the fifth round!

It is West Ham who seal their place in the fifth round of the FA Cup, then, where they will face Championship side Blackburn Rovers. It is harsh on Liverpool, who had the better of things over the two ties but ultimately lacked the cutting edge to turn their dominance into goals. That was the case again tonight, in particular with Benteke, who squandered a whole host of decent chances. West Ham created chances of their own, however, and contributed in no small part to what was an action-packed match here.

The woodwork was hit three times before the opening goal, with O'Brien and Payet hitting the upright for the Hammers and Coutinho being denied by the frame of the goal for Liverpool. The opener did finally come right at the end of the first half when Antonio fired a beauty of a volley into the corner from Valencia's cross, but Liverpool were quickly back on level terms at the start of the second half when Coutinho outfoxed the wall from a free kick, going low to catch the leaping defenders and the goalkeeper out. The match looked destined for penalties as we went into stoppage time of extra time, but Ogbonna popped up with a late, late winner for the hosts to send them through.

That is all we have time for this evening! Thank you very much for joining Sports Mole for tonight's action-packed cup tie as West Ham book their place in the fifth round in dramatic style. I will leave you with our match report, and be sure to stick around for reaction too. The second fourth round replay takes place tomorrow between Peterborough and West Brom, and we will also have live coverage of that, so check back in with us! For me, though, it is goodbye for now!