The 60-year-old, who took over at Broadfield Stadium last year, is to undergo major open-heart surgery in January which will require a lengthy period of recuperation.
Former Wolverhampton Wanderers boss Dean Saunders will take interim charge of the club.
Crawley are currently camped inside the League One relegation zone following an eight-game winless run.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Wrexham | 7 | 5 | 1 | 1 | 14 | 6 | 8 | 16 |
| 2 | Birmingham CityBirmingham | 6 | 5 | 1 | 0 | 13 | 6 | 7 | 16 |
| 3 | Barnsley | 7 | 4 | 1 | 2 | 12 | 10 | 2 | 13 |
| 4 | Charlton AthleticCharlton | 7 | 4 | 1 | 2 | 7 | 5 | 2 | 13 |
| 5 | Huddersfield TownHuddersfield | 6 | 4 | 0 | 2 | 11 | 6 | 5 | 12 |
| 6 | Stockport CountyStockport | 6 | 3 | 2 | 1 | 10 | 6 | 4 | 11 |
| 7 | Lincoln CityLincoln | 6 | 3 | 2 | 1 | 10 | 6 | 4 | 11 |
| 8 | Mansfield TownMansfield | 6 | 3 | 2 | 1 | 11 | 11 | 0 | 11 |
| 9 | Wycombe WanderersWycombe | 6 | 3 | 1 | 2 | 12 | 10 | 2 | 10 |
| 10 | Peterborough UnitedPeterborough | 6 | 3 | 1 | 2 | 10 | 9 | 1 | 10 |
| 11 | Exeter CityExeter | 6 | 3 | 0 | 3 | 8 | 6 | 2 | 9 |
| 12 | Northampton TownNorthampton | 6 | 2 | 2 | 2 | 8 | 7 | 1 | 8 |
| 13 | Blackpool | 6 | 2 | 2 | 2 | 11 | 13 | -2 | 8 |
| 14 | Wigan AthleticWigan | 6 | 2 | 1 | 3 | 6 | 5 | 1 | 7 |
| 15 | Stevenage | 6 | 2 | 1 | 3 | 5 | 5 | 0 | 7 |
| 16 | Reading | 6 | 2 | 1 | 3 | 7 | 10 | -3 | 7 |
| 17 | Crawley TownCrawley | 6 | 2 | 1 | 3 | 5 | 8 | -3 | 7 |
| 18 | Bolton WanderersBolton | 6 | 2 | 1 | 3 | 7 | 11 | -4 | 7 |
| 19 | Bristol Rovers | 7 | 2 | 1 | 4 | 6 | 11 | -5 | 7 |
| 20 | Leyton Orient | 6 | 2 | 0 | 4 | 7 | 9 | -2 | 6 |
| 21 | Rotherham UnitedRotherham | 7 | 1 | 3 | 3 | 5 | 9 | -4 | 6 |
| 22 | Burton Albion | 6 | 0 | 4 | 2 | 8 | 10 | -2 | 4 |
| 23 | Shrewsbury TownShrewsbury | 7 | 1 | 0 | 6 | 5 | 12 | -7 | 3 |
| 24 | Cambridge UnitedCambridge | 6 | 0 | 1 | 5 | 6 | 13 | -7 | 1 |
| > League One Full Table | |||||||||
