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 | York City | 24 | 15 | 6 | 3 | 48 | 20 | 28 | 51 |
| 2 | Forest Green RoversForest Green | 24 | 14 | 8 | 2 | 43 | 20 | 23 | 50 |
| 3 | Barnet | 25 | 15 | 5 | 5 | 51 | 30 | 21 | 50 |
| 4 | Gateshead | 25 | 14 | 5 | 6 | 49 | 32 | 17 | 47 |
| 5 | Oldham AthleticOldham | 22 | 12 | 7 | 3 | 39 | 21 | 18 | 43 |
| 6 | Solihull MoorsSolihull | 25 | 12 | 5 | 8 | 45 | 36 | 9 | 41 |
| 7 | Rochdale | 22 | 12 | 3 | 7 | 34 | 20 | 14 | 39 |
| 8 | Halifax TownHalifax | 24 | 9 | 9 | 6 | 26 | 23 | 3 | 36 |
| 9 | Hartlepool UnitedHartlepool | 25 | 9 | 9 | 7 | 31 | 30 | 1 | 36 |
| 10 | AltrinchamAltrincham | 24 | 9 | 8 | 7 | 37 | 30 | 7 | 35 |
| 11 | Yeovil TownYeovil | 25 | 10 | 5 | 10 | 31 | 29 | 2 | 35 |
| 12 | Eastleigh | 24 | 8 | 10 | 6 | 33 | 31 | 2 | 34 |
| 13 | Sutton UnitedSutton | 25 | 9 | 7 | 9 | 34 | 33 | 1 | 34 |
| 14 | Southend UnitedSouthend | 25 | 8 | 9 | 8 | 29 | 27 | 2 | 33 |
| 15 | Dagenham & RedbridgeDag & Red | 24 | 8 | 7 | 9 | 39 | 33 | 6 | 31 |
| 16 | Tamworth | 24 | 8 | 6 | 10 | 26 | 41 | -15 | 30 |
| 17 | Woking | 25 | 7 | 7 | 11 | 26 | 36 | -10 | 28 |
| 18 | Aldershot TownAldershot | 25 | 5 | 10 | 10 | 35 | 43 | -8 | 25 |
| 19 | WealdstoneWealdstone | 23 | 5 | 8 | 10 | 28 | 35 | -7 | 23 |
| 20 | Braintree TownBraintree | 25 | 6 | 5 | 14 | 23 | 36 | -13 | 23 |
| 21 | Maidenhead UnitedMaidenhead | 25 | 6 | 5 | 14 | 31 | 49 | -18 | 23 |
| 22 | Fylde | 24 | 6 | 4 | 14 | 29 | 50 | -21 | 22 |
| 23 | Boston UnitedBoston | 23 | 3 | 6 | 14 | 19 | 38 | -19 | 15 |
| 24 | Ebbsfleet | 25 | 1 | 6 | 18 | 17 | 60 | -43 | 9 |
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