Foster urges West Brom to deal in McAuley
The defender's current deal is inside the final 18 months.
Foster said: "He's a great story. He's come from nowhere to be a really, really good centre-back in the Premier League.
"He's up there for me among the best centre-backs in the league. He's fantastic.
"He's so calm on the ball and you know he will kick and head and he's amazing to have in front of you."