The 19-year-old impressed during a trial spell with the Buddies and has now been rewarded with a season-long contract.
MacGregor, who was released by Bolton Wanderers in June, spent the second half of last season on loan at Hamilton Academical.
He has represented Scotland at Under-19 level.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Birmingham CityBirmingham | 19 | 14 | 3 | 2 | 35 | 16 | 19 | 45 |
| 2 | Wycombe WanderersWycombe | 20 | 13 | 5 | 2 | 43 | 22 | 21 | 44 |
| 3 | Wrexham | 21 | 12 | 6 | 3 | 31 | 14 | 17 | 42 |
| 4 | Huddersfield TownHuddersfield | 20 | 12 | 3 | 5 | 34 | 18 | 16 | 39 |
| 5 | Stockport CountyStockport | 21 | 10 | 6 | 5 | 34 | 22 | 12 | 36 |
| 6 | Lincoln CityLincoln | 21 | 8 | 7 | 6 | 28 | 25 | 3 | 31 |
| 7 | Reading | 20 | 9 | 4 | 7 | 30 | 30 | 0 | 31 |
| 8 | Bolton WanderersBolton | 19 | 9 | 4 | 6 | 28 | 29 | -1 | 31 |
| 9 | Barnsley | 21 | 8 | 6 | 7 | 29 | 30 | -1 | 30 |
| 10 | Mansfield TownMansfield | 19 | 8 | 4 | 7 | 23 | 22 | 1 | 28 |
| 11 | Charlton AthleticCharlton | 20 | 7 | 6 | 7 | 23 | 19 | 4 | 27 |
| 12 | Blackpool | 20 | 7 | 6 | 7 | 29 | 31 | -2 | 27 |
| 13 | Exeter CityExeter | 20 | 8 | 3 | 9 | 19 | 22 | -3 | 27 |
| 14 | Stevenage | 19 | 7 | 5 | 7 | 15 | 17 | -2 | 26 |
| 15 | Leyton Orient | 20 | 7 | 4 | 9 | 23 | 20 | 3 | 25 |
| 16 | Peterborough UnitedPeterborough | 20 | 7 | 3 | 10 | 38 | 37 | 1 | 24 |
| 17 | Wigan AthleticWigan | 20 | 6 | 6 | 8 | 19 | 18 | 1 | 24 |
| 18 | Rotherham UnitedRotherham | 19 | 6 | 5 | 8 | 19 | 21 | -2 | 23 |
| 19 | Bristol Rovers | 20 | 6 | 4 | 10 | 18 | 29 | -11 | 22 |
| 20 | Northampton TownNorthampton | 21 | 5 | 6 | 10 | 21 | 34 | -13 | 21 |
| 21 | Crawley TownCrawley | 20 | 5 | 4 | 11 | 20 | 33 | -13 | 19 |
| 22 | Cambridge UnitedCambridge | 20 | 4 | 5 | 11 | 20 | 35 | -15 | 17 |
| 23 | Burton Albion | 20 | 2 | 6 | 12 | 17 | 32 | -15 | 12 |
| 24 | Shrewsbury TownShrewsbury | 20 | 3 | 3 | 14 | 21 | 41 | -20 | 12 |
| > League One Full Table | |||||||||
