Hart will be back for City tonight against Champions League opponents Viktoria Plzen.
Foster told the Telegraph: "I think as goalkeepers, we all feel for Joe Hart and what he's going through. He is one of the best goalkeepers I've ever played and trained with, he's just had a bit of a bad run. The ones he has been criticised for mostly haven't been huge clangers, but when you are England's No1, that's what goes with the territory. Everything is under the microscope, and it becomes a huge story.
"If I was his manager, I'd just put a big arm around him, tell him to go on holiday for a couple of weeks, clear his head, relax and then come back in the team and carry on doing what he's been doing for the last few years. Class is permanent and Joe is top class."
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