James Harrison says he's not a Hall of Famer, and Ryan Clark fears the Steelers legend might be right ... but he tells TMZ Sports he's hoping like hell his old teammate ends up being wrong.
Harrison admitted last week he doesn't believe his numbers are good enough to one day get a bust in Canton ... and when we spoke with Clark this week, he said he shares the same concerns as the guy he played with from 2006-2012.
"I would say he's borderline," Clark said of the ex-Pittsburgh pass rusher.