It's brief but he addresses it:
www.espn.com/mens-college-basketball/game?gameId=400916214
I'm not sure that is a reassuring answer. (It gives out when he puts pressure on it)
Please, dear basketball gods, protect and preserve our venerable leader...
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Update: looks like they took the interview video off. He basically said the above: "I'm not sure what's going on. It gives out whenever I put pressure on it." He said he'd get treatment from the trainers and go from there.
Good thing he has 4 days he can heal before the next game. Theoretically, we could probably win that UT game without him, if we really wanted to rest him. But I doubt Self would ever do that unless it threatened to be serious.