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 | York City | 19 | 12 | 5 | 2 | 37 | 14 | 23 | 41 |
| 2 | Forest Green RoversForest Green | 19 | 12 | 5 | 2 | 37 | 16 | 21 | 41 |
| 3 | Barnet | 19 | 13 | 1 | 5 | 40 | 23 | 17 | 40 |
| 4 | Gateshead | 19 | 11 | 4 | 4 | 35 | 24 | 11 | 37 |
| 5 | Oldham AthleticOldham | 18 | 9 | 7 | 2 | 29 | 17 | 12 | 34 |
| 6 | Rochdale | 18 | 9 | 3 | 6 | 27 | 18 | 9 | 30 |
| 7 | Halifax TownHalifax | 18 | 8 | 5 | 5 | 20 | 16 | 4 | 29 |
| 8 | Solihull MoorsSolihull | 19 | 8 | 4 | 7 | 35 | 32 | 3 | 28 |
| 9 | Yeovil TownYeovil | 19 | 8 | 4 | 7 | 21 | 20 | 1 | 28 |
| 10 | AltrinchamAltrincham | 19 | 7 | 6 | 6 | 29 | 25 | 4 | 27 |
| 11 | Sutton UnitedSutton | 18 | 7 | 4 | 7 | 26 | 26 | 0 | 25 |
| 12 | Eastleigh | 19 | 6 | 7 | 6 | 26 | 26 | 0 | 25 |
| 13 | Hartlepool UnitedHartlepool | 19 | 6 | 7 | 6 | 22 | 24 | -2 | 25 |
| 14 | Tamworth | 19 | 7 | 4 | 8 | 22 | 33 | -11 | 25 |
| 15 | Dagenham & RedbridgeDag & Red | 19 | 5 | 7 | 7 | 31 | 24 | 7 | 22 |
| 16 | Southend UnitedSouthend | 19 | 5 | 7 | 7 | 22 | 24 | -2 | 22 |
| 17 | Aldershot TownAldershot | 19 | 5 | 7 | 7 | 25 | 30 | -5 | 22 |
| 18 | Woking | 19 | 5 | 5 | 9 | 19 | 26 | -7 | 20 |
| 19 | WealdstoneWealdstone | 19 | 4 | 7 | 8 | 19 | 26 | -7 | 19 |
| 20 | Braintree TownBraintree | 19 | 5 | 4 | 10 | 15 | 23 | -8 | 19 |
| 21 | Fylde | 18 | 5 | 3 | 10 | 23 | 37 | -14 | 18 |
| 22 | Maidenhead UnitedMaidenhead | 19 | 4 | 4 | 11 | 21 | 36 | -15 | 16 |
| 23 | Boston UnitedBoston | 19 | 3 | 5 | 11 | 19 | 32 | -13 | 14 |
| 24 | Ebbsfleet | 18 | 1 | 5 | 12 | 15 | 43 | -28 | 8 |
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