Harrison: Week 3 Power Rankings
Who's on the rise, and who's on the decline after two games? Elliot Harrison ranks all the NFL teams, Nos. 1-32. More ...
"It was something we thought might have been the case after the game," coach Dennis Allen told the Bay Area News Group. "But it didn't seem like it was a major one. ... It's kind of a precautionary deal that we're going through the whole process to make sure he's fine."
McClain isn't sure when it happened. He said it's customary to absorb big hits and battle through, but "there was a time where I thought, 'I don't feel like myself.' "
UPDATE: McClain was back on the practice field Thursday, meaning he has cleared the NFL's concussion testing, the San Francisco Chronicle reports.