"That's good news," Harbaugh said of McClain's X-rays.
The Ravens are in a difficult situation at inside linebacker with Ray Lewis on injured reserve-designated to return with a surgically-repaired right triceps, starter Dannell Ellerbe out for the past two games with a right foot and ankle injury and now McClain injured.
Fullback Vonta Leach sustained a sprained ankle, but was walking around without issues following the game.
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Pro Bowl running back Ray Rice has a slight hip pointer. Rice rushed for 121 yards and a touchdown on 20 carries and didn't appear to be in major discomfort afterward in the locker room.
Pro Bowl outside linebacker Terrell Suggs was scratched with a torn right biceps. Upshaw started in his place.
The reigning NFL Defensive Player of the Year practiced on a limited basis Thursday and Friday and was listed as questionable.
All week, Suggs had indicated he would be a game-time decision.
Struggling with overload blitzes and conventional pass rushes, the offensive line allowed two sacks and three quarterback hits on Joe Flacco.
"I don't know what happened," said left offensive tackle Michael Oher, who had a rough game. "They brought guys off the edge. I guess they brought too many for us to block."
Kerrigan was completely unblocked, but Flacco took the blame for the turnover on a pass intended for Rice.
"I tried to get Ray something over there," Flacco said. And it was my fault."
Rookie right offensive tackle Kelechi Osemele downplayed the problems in pass protection.
"We had it protected fine, we had the communication fine," Osemele said. "Everybody protected well, everybody played their hearts out. We left it all out there."
In a rush
Griffin left the game in the fourth quarter with what was later diagnosed as a sprained right knee with no torn ligaments after being hit by defensive tackle Haloti Ngata.
"My good wasn't good enough," said Jones, who has 4 1/2 sacks for the season with at least one per game during the past three contests. "He's a hell of an athlete. I hit him one time and I thought he would be out and he battled back."