The Danish ace joined the Ligue 1 side from Benfica in 2012 following a loan stint at the club, and has been impressive ever since.
After establishing himself as one of the French top tier’s better midfielders, the 25-year-old is said to be keen to test himself in England, which has alerted Villa and Sunderland.
Wass – formerly a defender – netted nine goals in 38 league showings last term in a more advanced role, catching Paul Lambert’s and Gus Poyet’s attention.
The latter recently lost Jack Colback and is thought to be looking to get fresh bodies in, while the Midlanders’ chief is also desperate for signings on the cheap.
Evian are thought to be resigned to losing their man, with offers of around £3m likely to be accepted.
Wass is a full Denmark international with 10 caps to his name.