The 24-year-old picked up the knock in the first half of the club's 2-1 defeat to Chelsea at the weekend, but had been expected to return to training this week.
However, according to Sky Sports News, the Frenchman will sit out the next three weeks with the muscular injury.
Diaby has made five appearances for the club this season.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Liverpool | 20 | 14 | 5 | 1 | 48 | 20 | 28 | 47 |
| 2 | Arsenal | 21 | 12 | 7 | 2 | 41 | 19 | 22 | 43 |
| 3 | Nottingham ForestNott'm Forest | 21 | 12 | 5 | 4 | 30 | 20 | 10 | 41 |
| 4 | Newcastle UnitedNewcastle | 21 | 11 | 5 | 5 | 37 | 22 | 15 | 38 |
| 5 | Chelsea | 21 | 10 | 7 | 4 | 41 | 26 | 15 | 37 |
| 6 | Manchester CityMan City | 21 | 10 | 5 | 6 | 38 | 29 | 9 | 35 |
| 7 | Aston Villa | 21 | 10 | 5 | 6 | 31 | 32 | -1 | 35 |
| 8 | Bournemouth | 21 | 9 | 7 | 5 | 32 | 25 | 7 | 34 |
| 9 | Fulham | 21 | 7 | 9 | 5 | 32 | 30 | 2 | 30 |
| 10 | Brentford | 21 | 8 | 4 | 9 | 40 | 37 | 3 | 28 |
| 11 | Brighton & Hove AlbionBrighton | 20 | 6 | 10 | 4 | 30 | 29 | 1 | 28 |
| 12 | West Ham UnitedWest Ham | 21 | 7 | 5 | 9 | 27 | 41 | -14 | 26 |
| 13 | Tottenham HotspurSpurs | 21 | 7 | 3 | 11 | 43 | 32 | 11 | 24 |
| 14 | Crystal Palace | 21 | 5 | 9 | 7 | 23 | 28 | -5 | 24 |
| 15 | Manchester UnitedMan Utd | 20 | 6 | 5 | 9 | 23 | 28 | -5 | 23 |
| 16 | Everton | 20 | 3 | 8 | 9 | 15 | 26 | -11 | 17 |
| 17 | Ipswich TownIpswich | 20 | 3 | 7 | 10 | 20 | 35 | -15 | 16 |
| 18 | Wolverhampton WanderersWolves | 21 | 4 | 4 | 13 | 31 | 48 | -17 | 16 |
| 19 | Leicester CityLeicester | 21 | 3 | 5 | 13 | 23 | 46 | -23 | 14 |
| 20 | Southampton | 20 | 1 | 3 | 16 | 12 | 44 | -32 | 6 |
| > Premier League Full Table | |||||||||
