Joe Hart's withdrawal through injury means Foster, who replaced him between the posts at St. Andrew's this season, is favourite to start his first international for 12 months.
He played successive internationals against Belarus at Wembley and then Brazil in Doha last season.
McLeish told Press Association Sport: "I think Ben just needed games and he is looking every inch a top class keeper.
"At the end of the day, a keeper makes a mistake and it is normally a goal. That is the pressures they are under and must face and someday they will make a mistake.
"But the top ones make very few, that's the key, to a great keeper, and Ben has been excellent this season. Ben has been very, very solid for us in everything he's done - his taking of crosses, his distribution, his communication."