The 30-year-old had been training with the Latics after being released by Bradford at the end of last season.
Yeates's previous clubs include Middlesbrough, Sheffield United and Watford.
He could make his debut on Saturday when Oldham travel to local rivals Bury in League One.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | York City | 16 | 10 | 5 | 1 | 28 | 9 | 19 | 35 |
| 2 | Forest Green RoversForest Green | 16 | 10 | 4 | 2 | 29 | 13 | 16 | 34 |
| 3 | Barnet | 16 | 11 | 0 | 5 | 34 | 20 | 14 | 33 |
| 4 | Gateshead | 16 | 10 | 3 | 3 | 28 | 19 | 9 | 33 |
| 5 | Oldham AthleticOldham | 16 | 8 | 6 | 2 | 25 | 17 | 8 | 30 |
| 6 | Rochdale | 16 | 8 | 3 | 5 | 25 | 15 | 10 | 27 |
| 7 | Yeovil TownYeovil | 16 | 7 | 4 | 5 | 20 | 15 | 5 | 25 |
| 8 | Solihull MoorsSolihull | 16 | 7 | 3 | 6 | 23 | 25 | -2 | 24 |
| 9 | AltrinchamAltrincham | 16 | 6 | 5 | 5 | 23 | 20 | 3 | 23 |
| 10 | Halifax TownHalifax | 16 | 6 | 5 | 5 | 18 | 16 | 2 | 23 |
| 11 | Eastleigh | 16 | 6 | 5 | 5 | 24 | 23 | 1 | 23 |
| 12 | Sutton UnitedSutton | 16 | 6 | 4 | 6 | 24 | 24 | 0 | 22 |
| 13 | Dagenham & RedbridgeDag & Red | 16 | 5 | 6 | 5 | 26 | 17 | 9 | 21 |
| 14 | Southend UnitedSouthend | 16 | 5 | 6 | 5 | 20 | 19 | 1 | 21 |
| 15 | Hartlepool UnitedHartlepool | 16 | 5 | 6 | 5 | 15 | 16 | -1 | 21 |
| 16 | Tamworth | 16 | 6 | 3 | 7 | 19 | 27 | -8 | 21 |
| 17 | Aldershot TownAldershot | 16 | 4 | 6 | 6 | 21 | 25 | -4 | 18 |
| 18 | Woking | 16 | 4 | 5 | 7 | 18 | 23 | -5 | 17 |
| 19 | Maidenhead UnitedMaidenhead | 16 | 4 | 4 | 8 | 20 | 26 | -6 | 16 |
| 20 | Fylde | 16 | 4 | 3 | 9 | 20 | 36 | -16 | 15 |
| 21 | Braintree TownBraintree | 16 | 3 | 4 | 9 | 11 | 19 | -8 | 13 |
| 22 | WealdstoneWealdstone | 16 | 2 | 6 | 8 | 14 | 25 | -11 | 12 |
| 23 | Boston UnitedBoston | 16 | 2 | 4 | 10 | 15 | 29 | -14 | 10 |
| 24 | Ebbsfleet | 16 | 1 | 4 | 11 | 14 | 36 | -22 | 7 |
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