The 26-year-old arrived at St James Park for an initial one-month loan deal and has scored one goal since.
Nicholls has made four appearances for Exeter since joining on loan and has the option to be recalled back to Northampton.
The striker formerly played for Walsall and made 191 appearances for the club before moving to the Cobblers in 2012.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Wycombe WanderersWycombe | 23 | 15 | 5 | 3 | 49 | 25 | 24 | 50 |
| 2 | Birmingham CityBirmingham | 22 | 15 | 5 | 2 | 38 | 17 | 21 | 50 |
| 3 | Wrexham | 24 | 14 | 6 | 4 | 36 | 18 | 18 | 48 |
| 4 | Huddersfield TownHuddersfield | 22 | 13 | 4 | 5 | 36 | 19 | 17 | 43 |
| 5 | Reading | 23 | 12 | 4 | 7 | 39 | 33 | 6 | 40 |
| 6 | Barnsley | 24 | 11 | 6 | 7 | 36 | 33 | 3 | 39 |
| 7 | Stockport CountyStockport | 24 | 10 | 8 | 6 | 36 | 25 | 11 | 38 |
| 8 | Leyton Orient | 23 | 10 | 4 | 9 | 31 | 22 | 9 | 34 |
| 9 | Mansfield TownMansfield | 22 | 10 | 4 | 8 | 29 | 25 | 4 | 34 |
| 10 | Bolton WanderersBolton | 22 | 10 | 4 | 8 | 33 | 33 | 0 | 34 |
| 11 | Charlton AthleticCharlton | 22 | 9 | 6 | 7 | 27 | 21 | 6 | 33 |
| 12 | Lincoln CityLincoln | 24 | 8 | 7 | 9 | 28 | 30 | -2 | 31 |
| 13 | Exeter CityExeter | 23 | 9 | 4 | 10 | 27 | 29 | -2 | 31 |
| 14 | Stevenage | 22 | 8 | 6 | 8 | 18 | 20 | -2 | 30 |
| 15 | Blackpool | 23 | 7 | 8 | 8 | 31 | 34 | -3 | 29 |
| 16 | Wigan AthleticWigan | 22 | 7 | 6 | 9 | 21 | 20 | 1 | 27 |
| 17 | Rotherham UnitedRotherham | 22 | 7 | 6 | 9 | 21 | 23 | -2 | 27 |
| 18 | Peterborough UnitedPeterborough | 23 | 7 | 4 | 12 | 41 | 45 | -4 | 25 |
| 19 | Northampton TownNorthampton | 24 | 5 | 8 | 11 | 23 | 39 | -16 | 23 |
| 20 | Bristol Rovers | 23 | 6 | 4 | 13 | 21 | 38 | -17 | 22 |
| 21 | Crawley TownCrawley | 22 | 5 | 5 | 12 | 24 | 40 | -16 | 20 |
| 22 | Shrewsbury TownShrewsbury | 23 | 4 | 5 | 14 | 24 | 43 | -19 | 17 |
| 23 | Cambridge UnitedCambridge | 23 | 4 | 5 | 14 | 22 | 42 | -20 | 17 |
| 24 | Burton Albion | 23 | 2 | 8 | 13 | 20 | 37 | -17 | 14 |
| > League One Full Table | |||||||||
