The Eredivisie side have told the 27-year-old that he can leave if a suitable bid is made.
The Dutch international is now thought to have been all but signed a contract at Villa Park, according to The Sun.
Vlaar was part of the Netherlands team that failed to win a game at Euro 2012.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Liverpool | 21 | 15 | 5 | 1 | 50 | 20 | 30 | 50 |
| 2 | Arsenal | 22 | 12 | 8 | 2 | 43 | 21 | 22 | 44 |
| 3 | Nottingham ForestNott'm Forest | 22 | 13 | 5 | 4 | 33 | 22 | 11 | 44 |
| 4 | Chelsea | 22 | 11 | 7 | 4 | 44 | 27 | 17 | 40 |
| 5 | Manchester CityMan City | 22 | 11 | 5 | 6 | 44 | 29 | 15 | 38 |
| 6 | Newcastle UnitedNewcastle | 22 | 11 | 5 | 6 | 38 | 26 | 12 | 38 |
| 7 | Bournemouth | 22 | 10 | 7 | 5 | 36 | 26 | 10 | 37 |
| 8 | Aston Villa | 22 | 10 | 6 | 6 | 33 | 34 | -1 | 36 |
| 9 | Brighton & Hove AlbionBrighton | 22 | 8 | 10 | 4 | 35 | 30 | 5 | 34 |
| 10 | Fulham | 22 | 8 | 9 | 5 | 34 | 30 | 4 | 33 |
| 11 | Brentford | 22 | 8 | 4 | 10 | 40 | 39 | 1 | 28 |
| 12 | Crystal Palace | 22 | 6 | 9 | 7 | 25 | 28 | -3 | 27 |
| 13 | Manchester UnitedMan Utd | 22 | 7 | 5 | 10 | 27 | 32 | -5 | 26 |
| 14 | West Ham UnitedWest Ham | 22 | 7 | 5 | 10 | 27 | 43 | -16 | 26 |
| 15 | Tottenham HotspurSpurs | 22 | 7 | 3 | 12 | 45 | 35 | 10 | 24 |
| 16 | Everton | 21 | 4 | 8 | 9 | 18 | 28 | -10 | 20 |
| 17 | Wolverhampton WanderersWolves | 22 | 4 | 4 | 14 | 32 | 51 | -19 | 16 |
| 18 | Ipswich TownIpswich | 22 | 3 | 7 | 12 | 20 | 43 | -23 | 16 |
| 19 | Leicester CityLeicester | 22 | 3 | 5 | 14 | 23 | 48 | -25 | 14 |
| 20 | Southampton | 22 | 1 | 3 | 18 | 15 | 50 | -35 | 6 |
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