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 | |
| 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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