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 | |
| C | Chesterfield | 46 | 31 | 5 | 10 | 106 | 65 | 41 | 98 |
| 2 | Barnet | 46 | 26 | 8 | 12 | 91 | 60 | 31 | 86 |
| 3 | Bromley | 46 | 22 | 15 | 9 | 73 | 49 | 24 | 81 |
| 4 | AltrinchamAltrincham | 46 | 22 | 11 | 13 | 84 | 59 | 25 | 77 |
| 5 | Solihull MoorsSolihull | 46 | 21 | 13 | 12 | 71 | 62 | 9 | 76 |
| 6 | Gateshead | 46 | 22 | 9 | 15 | 88 | 64 | 24 | 75 |
| 7 | Halifax TownHalifax | 46 | 19 | 14 | 13 | 58 | 50 | 8 | 71 |
| 8 | Aldershot TownAldershot | 46 | 20 | 9 | 17 | 74 | 83 | -9 | 69 |
| 9 | Southend UnitedSouthend | 46 | 21 | 12 | 13 | 70 | 45 | 25 | 65 |
| 10 | Oldham AthleticOldham | 46 | 15 | 18 | 13 | 63 | 60 | 3 | 63 |
| 11 | Rochdale | 46 | 16 | 14 | 16 | 69 | 64 | 5 | 62 |
| 12 | Hartlepool UnitedHartlepool | 46 | 17 | 9 | 20 | 70 | 82 | -12 | 60 |
| 13 | Eastleigh | 46 | 16 | 11 | 19 | 73 | 87 | -14 | 59 |
| 14 | Maidenhead UnitedMaidenhead | 46 | 15 | 13 | 18 | 60 | 67 | -7 | 58 |
| 15 | Dagenham & RedbridgeDag & Red | 46 | 14 | 14 | 18 | 69 | 63 | 6 | 56 |
| 16 | WealdstoneWealdstone | 46 | 15 | 11 | 20 | 60 | 72 | -12 | 56 |
| 17 | Woking | 46 | 15 | 10 | 21 | 49 | 55 | -6 | 55 |
| 18 | Fylde | 46 | 15 | 10 | 21 | 74 | 82 | -8 | 55 |
| 19 | Ebbsfleet | 46 | 14 | 12 | 20 | 59 | 74 | -15 | 54 |
| 20 | York City | 46 | 12 | 17 | 17 | 55 | 69 | -14 | 53 |
| 21 | Boreham WoodBoreham Wood | 46 | 12 | 16 | 18 | 59 | 73 | -14 | 52 |
| 22 | Kidderminster HarriersKidderminster | 46 | 11 | 13 | 22 | 40 | 59 | -19 | 46 |
| 23 | Dorking WanderersDorking | 46 | 12 | 9 | 25 | 54 | 85 | -31 | 45 |
| 24 | Oxford CityOxford City | 46 | 8 | 9 | 29 | 54 | 94 | -40 | 33 |
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