The 32-year-old's deal at Upton Park was not due to expire until next summer.
However, having made just eight appearances in all competitions last term, the Hammers have allowed the former France international to find himself another club.
Diarra, who had a loan spell with Rennes last year, joined West Ham from Marseille back in 2012.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Manchester CityMan City | 37 | 27 | 7 | 3 | 93 | 33 | 60 | 88 |
| 2 | Arsenal | 37 | 27 | 5 | 5 | 89 | 28 | 61 | 86 |
| 3 | Liverpool | 37 | 23 | 10 | 4 | 84 | 41 | 43 | 79 |
| 4 | Aston Villa | 37 | 20 | 8 | 9 | 76 | 56 | 20 | 68 |
| 5 | Tottenham HotspurSpurs | 37 | 19 | 6 | 12 | 71 | 61 | 10 | 63 |
| 6 | Chelsea | 37 | 17 | 9 | 11 | 75 | 62 | 13 | 60 |
| 7 | Newcastle UnitedNewcastle | 37 | 17 | 6 | 14 | 81 | 60 | 21 | 57 |
| 8 | Manchester UnitedMan Utd | 37 | 17 | 6 | 14 | 55 | 58 | -3 | 57 |
| 9 | West Ham UnitedWest Ham | 37 | 14 | 10 | 13 | 59 | 71 | -12 | 52 |
| 10 | Brighton & Hove AlbionBrighton | 37 | 12 | 12 | 13 | 55 | 60 | -5 | 48 |
| 11 | Bournemouth | 37 | 13 | 9 | 15 | 53 | 65 | -12 | 48 |
| 12 | Crystal Palace | 37 | 12 | 10 | 15 | 52 | 58 | -6 | 46 |
| 13 | Wolverhampton WanderersWolves | 37 | 13 | 7 | 17 | 50 | 63 | -13 | 46 |
| 14 | Fulham | 37 | 12 | 8 | 17 | 51 | 59 | -8 | 44 |
| 15 | Everton | 37 | 13 | 9 | 15 | 39 | 49 | -10 | 40 |
| 16 | Brentford | 37 | 10 | 9 | 18 | 54 | 61 | -7 | 39 |
| 17 | Nottingham ForestNott'm Forest | 37 | 8 | 9 | 20 | 47 | 66 | -19 | 29 |
| 18 | Luton TownLuton | 37 | 6 | 8 | 23 | 50 | 81 | -31 | 26 |
| R | Burnley | 37 | 5 | 9 | 23 | 40 | 76 | -36 | 24 |
| R | Sheffield UnitedSheff Utd | 37 | 3 | 7 | 27 | 35 | 101 | -66 | 16 |
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