The 28-year-old has moved to the League Two club following a temporary spell with Scunthorpe United.
Olejnik could make his debut for York on Saturday when they make the trip to leaders Wycombe Wanderers.
York are currently in 18th place in the League Two table.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Barnet | 30 | 19 | 6 | 5 | 60 | 30 | 30 | 63 |
| 2 | Forest Green RoversForest Green | 29 | 16 | 11 | 2 | 48 | 22 | 26 | 59 |
| 3 | York City | 28 | 17 | 6 | 5 | 54 | 26 | 28 | 57 |
| 4 | Oldham AthleticOldham | 28 | 14 | 9 | 5 | 46 | 30 | 16 | 51 |
| 5 | Gateshead | 28 | 14 | 7 | 7 | 51 | 36 | 15 | 49 |
| 6 | Halifax TownHalifax | 28 | 12 | 9 | 7 | 34 | 26 | 8 | 45 |
| 7 | Rochdale | 25 | 13 | 3 | 9 | 38 | 22 | 16 | 42 |
| 8 | AltrinchamAltrincham | 27 | 11 | 9 | 7 | 44 | 32 | 12 | 42 |
| 9 | Solihull MoorsSolihull | 29 | 12 | 6 | 11 | 46 | 41 | 5 | 42 |
| 10 | Sutton UnitedSutton | 28 | 11 | 8 | 9 | 39 | 36 | 3 | 41 |
| 11 | Southend UnitedSouthend | 28 | 10 | 9 | 9 | 33 | 30 | 3 | 39 |
| 12 | Hartlepool UnitedHartlepool | 29 | 9 | 12 | 8 | 34 | 35 | -1 | 39 |
| 13 | Eastleigh | 28 | 9 | 11 | 8 | 37 | 36 | 1 | 38 |
| 14 | Yeovil TownYeovil | 29 | 10 | 8 | 11 | 33 | 35 | -2 | 38 |
| 15 | Tamworth | 28 | 10 | 7 | 11 | 32 | 44 | -12 | 37 |
| 16 | Dagenham & RedbridgeDag & Red | 28 | 8 | 8 | 12 | 41 | 40 | 1 | 32 |
| 17 | Woking | 28 | 7 | 10 | 11 | 29 | 39 | -10 | 31 |
| 18 | Braintree TownBraintree | 29 | 8 | 7 | 14 | 28 | 39 | -11 | 31 |
| 19 | Aldershot TownAldershot | 28 | 6 | 12 | 10 | 42 | 48 | -6 | 30 |
| 20 | Fylde | 29 | 8 | 4 | 17 | 35 | 59 | -24 | 28 |
| 21 | WealdstoneWealdstone | 28 | 5 | 11 | 12 | 32 | 42 | -10 | 26 |
| 22 | Maidenhead UnitedMaidenhead | 28 | 7 | 5 | 16 | 35 | 57 | -22 | 26 |
| 23 | Boston UnitedBoston | 26 | 4 | 7 | 15 | 24 | 44 | -20 | 19 |
| 24 | Ebbsfleet | 30 | 1 | 9 | 20 | 21 | 67 | -46 | 12 |
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