The 20-year-old has impressed for Wales at Under-21 level, but has only made three appearances for Russell Slade's side.
Vale are currently missing the creative presence of Louis Dodds and could look to O'Sullivan to fill an enterprising role in the middle.
Rob Page and his Valiants currently hold 14th position in the League One table.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Walsall | 19 | 12 | 4 | 3 | 35 | 19 | 16 | 40 |
| 2 | Port Vale | 20 | 10 | 6 | 4 | 26 | 19 | 7 | 36 |
| 3 | Crewe AlexandraCrewe | 19 | 9 | 7 | 3 | 24 | 16 | 8 | 34 |
| 4 | AFC Wimbledon | 19 | 10 | 3 | 6 | 31 | 16 | 15 | 33 |
| 5 | Doncaster RoversDoncaster | 20 | 9 | 6 | 5 | 28 | 23 | 5 | 33 |
| 6 | Chesterfield | 20 | 8 | 7 | 5 | 35 | 23 | 12 | 31 |
| 7 | Grimsby Town | 20 | 10 | 1 | 9 | 27 | 30 | -3 | 31 |
| 8 | MK Dons | 18 | 9 | 3 | 6 | 30 | 20 | 10 | 30 |
| 9 | Gillingham | 19 | 9 | 2 | 8 | 20 | 16 | 4 | 29 |
| 10 | Bradford CityBradford | 19 | 7 | 7 | 5 | 24 | 19 | 5 | 28 |
| 11 | Notts County | 19 | 7 | 7 | 5 | 25 | 21 | 4 | 28 |
| 12 | Salford City | 19 | 7 | 6 | 6 | 20 | 19 | 1 | 27 |
| 13 | Cheltenham TownCheltenham | 20 | 7 | 5 | 8 | 27 | 28 | -1 | 26 |
| 14 | Bromley | 19 | 5 | 9 | 5 | 23 | 23 | 0 | 24 |
| 15 | BarrowBarrow | 19 | 6 | 5 | 8 | 18 | 18 | 0 | 23 |
| 16 | Newport CountyNewport | 19 | 6 | 5 | 8 | 21 | 28 | -7 | 23 |
| 17 | Fleetwood TownFleetwood | 17 | 5 | 7 | 5 | 23 | 22 | 1 | 22 |
| 18 | Colchester UnitedColchester | 19 | 4 | 10 | 5 | 23 | 22 | 1 | 22 |
| 19 | Tranmere RoversTranmere | 19 | 5 | 6 | 8 | 14 | 26 | -12 | 21 |
| 20 | Harrogate TownHarrogate | 20 | 6 | 3 | 11 | 17 | 30 | -13 | 21 |
| 21 | Accrington StanleyAccrington | 18 | 4 | 6 | 8 | 25 | 33 | -8 | 18 |
| 22 | Swindon TownSwindon | 20 | 3 | 7 | 10 | 23 | 34 | -11 | 16 |
| 23 | Morecambe | 20 | 3 | 5 | 12 | 19 | 36 | -17 | 14 |
| 24 | Carlisle UnitedCarlisle | 19 | 3 | 5 | 11 | 15 | 32 | -17 | 14 |
| > League Two Full Table | |||||||||
