The 34-year-old, who moved to St Andrew's on a free transfer in October, will now remain with the Blues until December 17 at the earliest.
He has yet to make his debut for the Championship outfit, but has been named as a substitute on six occasions.
Diop has been capped 63 times by Senegal at senior international level.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Wycombe WanderersWycombe | 18 | 12 | 4 | 2 | 39 | 21 | 18 | 40 |
| 2 | Wrexham | 19 | 12 | 4 | 3 | 28 | 11 | 17 | 40 |
| 3 | Birmingham CityBirmingham | 17 | 12 | 3 | 2 | 32 | 16 | 16 | 39 |
| 4 | Huddersfield TownHuddersfield | 18 | 11 | 2 | 5 | 28 | 16 | 12 | 35 |
| 5 | Stockport CountyStockport | 19 | 9 | 6 | 4 | 31 | 19 | 12 | 33 |
| 6 | Reading | 18 | 9 | 4 | 5 | 30 | 25 | 5 | 31 |
| 7 | Bolton WanderersBolton | 17 | 9 | 3 | 5 | 28 | 27 | 1 | 30 |
| 8 | Barnsley | 19 | 7 | 6 | 6 | 27 | 25 | 2 | 27 |
| 9 | Lincoln CityLincoln | 19 | 7 | 6 | 6 | 24 | 23 | 1 | 27 |
| 10 | Mansfield TownMansfield | 17 | 7 | 3 | 7 | 22 | 22 | 0 | 24 |
| 11 | Exeter CityExeter | 18 | 7 | 3 | 8 | 16 | 19 | -3 | 24 |
| 12 | Charlton AthleticCharlton | 18 | 6 | 5 | 7 | 18 | 19 | -1 | 23 |
| 13 | Blackpool | 18 | 6 | 5 | 7 | 26 | 31 | -5 | 23 |
| 14 | Stevenage | 17 | 6 | 4 | 7 | 13 | 16 | -3 | 22 |
| 15 | Peterborough UnitedPeterborough | 18 | 6 | 3 | 9 | 33 | 32 | 1 | 21 |
| 16 | Leyton Orient | 18 | 6 | 3 | 9 | 19 | 20 | -1 | 21 |
| 17 | Northampton TownNorthampton | 19 | 5 | 6 | 8 | 21 | 26 | -5 | 21 |
| 18 | Bristol Rovers | 18 | 6 | 3 | 9 | 17 | 26 | -9 | 21 |
| 19 | Wigan AthleticWigan | 18 | 5 | 5 | 8 | 15 | 16 | -1 | 20 |
| 20 | Rotherham UnitedRotherham | 17 | 5 | 5 | 7 | 16 | 20 | -4 | 20 |
| 21 | Crawley TownCrawley | 18 | 5 | 4 | 9 | 17 | 28 | -11 | 19 |
| 22 | Cambridge UnitedCambridge | 18 | 4 | 4 | 10 | 18 | 29 | -11 | 16 |
| 23 | Burton Albion | 18 | 2 | 5 | 11 | 16 | 30 | -14 | 11 |
| 24 | Shrewsbury TownShrewsbury | 18 | 3 | 2 | 13 | 18 | 35 | -17 | 11 |
| > League One Full Table | |||||||||
