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 | 12 | 10 | 1 | 1 | 24 | 8 | 16 | 31 |
| 2 | Arsenal | 13 | 7 | 4 | 2 | 26 | 14 | 12 | 25 |
| 3 | Manchester CityMan City | 12 | 7 | 2 | 3 | 22 | 17 | 5 | 23 |
| 4 | Brighton & Hove AlbionBrighton | 13 | 6 | 5 | 2 | 22 | 17 | 5 | 23 |
| 5 | Chelsea | 12 | 6 | 4 | 2 | 23 | 14 | 9 | 22 |
| 6 | Nottingham ForestNott'm Forest | 13 | 6 | 4 | 3 | 16 | 13 | 3 | 22 |
| 7 | Brentford | 13 | 6 | 2 | 5 | 26 | 23 | 3 | 20 |
| 8 | Tottenham HotspurSpurs | 12 | 6 | 1 | 5 | 27 | 13 | 14 | 19 |
| 9 | Aston Villa | 12 | 5 | 4 | 3 | 19 | 19 | 0 | 19 |
| 10 | Newcastle UnitedNewcastle | 13 | 5 | 4 | 4 | 14 | 14 | 0 | 19 |
| 11 | Bournemouth | 13 | 5 | 3 | 5 | 20 | 19 | 1 | 18 |
| 12 | Fulham | 12 | 5 | 3 | 4 | 17 | 17 | 0 | 18 |
| 13 | Manchester UnitedMan Utd | 12 | 4 | 4 | 4 | 13 | 13 | 0 | 16 |
| 14 | West Ham UnitedWest Ham | 13 | 4 | 3 | 6 | 17 | 24 | -7 | 15 |
| 15 | Everton | 12 | 2 | 5 | 5 | 10 | 17 | -7 | 11 |
| 16 | Leicester CityLeicester | 13 | 2 | 4 | 7 | 16 | 27 | -11 | 10 |
| 17 | Crystal Palace | 13 | 1 | 6 | 6 | 11 | 18 | -7 | 9 |
| 18 | Wolverhampton WanderersWolves | 13 | 2 | 3 | 8 | 22 | 32 | -10 | 9 |
| 19 | Ipswich TownIpswich | 13 | 1 | 6 | 6 | 13 | 24 | -11 | 9 |
| 20 | Southampton | 13 | 1 | 2 | 10 | 10 | 25 | -15 | 5 |
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