The 24-year-old has penned a one-year contract at Boundary Park, with the option to extend his stay by a further 12 months.
Cornell was released by Swansea at the end of last season having made just one senior appearance for the club.
Oldham start their League One campaign on August 8 with a trip to Walsall.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Barnet | 31 | 19 | 7 | 5 | 60 | 30 | 30 | 64 |
| 2 | Forest Green RoversForest Green | 30 | 17 | 11 | 2 | 50 | 23 | 27 | 62 |
| 3 | York City | 29 | 18 | 6 | 5 | 57 | 26 | 31 | 60 |
| 4 | Oldham AthleticOldham | 30 | 15 | 10 | 5 | 49 | 32 | 17 | 55 |
| 5 | Gateshead | 29 | 15 | 7 | 7 | 55 | 36 | 19 | 52 |
| 6 | Halifax TownHalifax | 30 | 13 | 9 | 8 | 37 | 30 | 7 | 48 |
| 7 | AltrinchamAltrincham | 29 | 12 | 10 | 7 | 49 | 35 | 14 | 46 |
| 8 | Rochdale | 26 | 13 | 4 | 9 | 38 | 22 | 16 | 43 |
| 9 | Hartlepool UnitedHartlepool | 31 | 10 | 13 | 8 | 38 | 38 | 0 | 43 |
| 10 | Solihull MoorsSolihull | 30 | 12 | 6 | 12 | 46 | 42 | 4 | 42 |
| 11 | Southend UnitedSouthend | 30 | 11 | 9 | 10 | 36 | 32 | 4 | 42 |
| 12 | Sutton UnitedSutton | 29 | 11 | 8 | 10 | 40 | 38 | 2 | 41 |
| 13 | Yeovil TownYeovil | 30 | 10 | 9 | 11 | 34 | 36 | -2 | 39 |
| 14 | Eastleigh | 29 | 9 | 11 | 9 | 38 | 38 | 0 | 38 |
| 15 | Tamworth | 30 | 10 | 8 | 12 | 35 | 48 | -13 | 38 |
| 16 | Woking | 30 | 8 | 10 | 12 | 31 | 43 | -12 | 34 |
| 17 | Dagenham & RedbridgeDag & Red | 30 | 8 | 9 | 13 | 43 | 43 | 0 | 33 |
| 18 | Braintree TownBraintree | 30 | 8 | 7 | 15 | 29 | 42 | -13 | 31 |
| 19 | Aldershot TownAldershot | 28 | 6 | 12 | 10 | 42 | 48 | -6 | 30 |
| 20 | Maidenhead UnitedMaidenhead | 29 | 8 | 5 | 16 | 36 | 57 | -21 | 29 |
| 21 | Fylde | 29 | 8 | 4 | 17 | 35 | 59 | -24 | 28 |
| 22 | WealdstoneWealdstone | 29 | 5 | 11 | 13 | 32 | 46 | -14 | 26 |
| 23 | Boston UnitedBoston | 27 | 4 | 8 | 15 | 24 | 44 | -20 | 20 |
| 24 | Ebbsfleet | 31 | 1 | 10 | 20 | 21 | 67 | -46 | 13 |
| > National League Full Table | |||||||||
