Hart, axed from the starting line-up at City, will play for England against Germany tomorrow night.
Seaman told Absolute Radio's Rock 'N' Roll Football Show: "I would imagine he's going through a lot of frustration at the moment , because when I was going through a bad patch the first thing I wanted to do was play another game, to try and get it out of the way and then rebuild your confidence.
"With Joe he's going to have a bit of trouble doing that because obviously he's not playing at City. If he doesn't play what's going to happen? My only worry now is when does he get back into Man City?"
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