The 23-year-old featured on a regular basis for York City during the most recent League Two campaign, but he has not been offered a new contract by the Minstermen.
That news has alerted Pompey, who will meet with the winger tomorrow to discuss terms, according to PA Sport.
Blair had spent his entire career with non-league teams until he signed for York in 2011.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Barnet | 12 | 9 | 0 | 3 | 25 | 11 | 14 | 27 |
| 2 | York City | 12 | 7 | 4 | 1 | 18 | 6 | 12 | 25 |
| 3 | Forest Green RoversForest Green | 12 | 7 | 3 | 2 | 20 | 9 | 11 | 24 |
| 4 | Rochdale | 12 | 7 | 2 | 3 | 20 | 9 | 11 | 23 |
| 5 | Gateshead | 11 | 7 | 2 | 2 | 22 | 15 | 7 | 23 |
| 6 | Oldham AthleticOldham | 12 | 6 | 5 | 1 | 17 | 11 | 6 | 23 |
| 7 | Eastleigh | 12 | 6 | 3 | 3 | 19 | 15 | 4 | 21 |
| 8 | Sutton UnitedSutton | 12 | 5 | 4 | 3 | 19 | 16 | 3 | 19 |
| 9 | AltrinchamAltrincham | 12 | 5 | 3 | 4 | 15 | 15 | 0 | 18 |
| 10 | Dagenham & RedbridgeDag & Red | 12 | 4 | 5 | 3 | 20 | 13 | 7 | 17 |
| 11 | Halifax TownHalifax | 12 | 4 | 5 | 3 | 12 | 10 | 2 | 17 |
| 12 | Yeovil TownYeovil | 12 | 4 | 3 | 5 | 13 | 14 | -1 | 15 |
| 13 | Woking | 12 | 4 | 3 | 5 | 13 | 16 | -3 | 15 |
| 14 | Solihull MoorsSolihull | 12 | 4 | 3 | 5 | 14 | 18 | -4 | 15 |
| 15 | Aldershot TownAldershot | 12 | 3 | 5 | 4 | 17 | 17 | 0 | 14 |
| 16 | Southend UnitedSouthend | 12 | 3 | 5 | 4 | 17 | 17 | 0 | 14 |
| 17 | Tamworth | 11 | 4 | 2 | 5 | 12 | 19 | -7 | 14 |
| 18 | Hartlepool UnitedHartlepool | 12 | 3 | 4 | 5 | 7 | 11 | -4 | 13 |
| 19 | Maidenhead UnitedMaidenhead | 12 | 3 | 2 | 7 | 14 | 20 | -6 | 11 |
| 20 | Braintree TownBraintree | 12 | 2 | 4 | 6 | 6 | 13 | -7 | 10 |
| 21 | Boston UnitedBoston | 12 | 2 | 3 | 7 | 12 | 22 | -10 | 9 |
| 22 | Fylde | 12 | 2 | 3 | 7 | 13 | 24 | -11 | 9 |
| 23 | WealdstoneWealdstone | 12 | 1 | 5 | 6 | 9 | 17 | -8 | 8 |
| 24 | Ebbsfleet | 12 | 1 | 2 | 9 | 9 | 25 | -16 | 5 |
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