Carr left the second quarter of Sunday's 35-7 thumping of the Pittsburgh Steelers after re-aggravating the left hamstring injury that has been nagging him throughout the preseason. Carr did not return for the second half, but coach John Harbaugh said the hamstring is intact.
"The good news is, it's not a tear," Harbaugh said Monday during his post-game media session. "So it's grabbing on him at times. One of these times, he's going to get through and it's not going to grab on him. But the thing we do want to avoid -- and I think your point is well taken -- is we don't want it to tear. We don't want a hamstring tear. That's why we've shut him down pretty quick whenever he starts to have an issue."
The injuries to Carr and Smith left the defense with just three healthy cornerbacks in starters Cary Williams and Lardarius Webb and backup Domonique Foxworth.
Harbaugh conceded that the situation was even more dire when Williams left briefly after suffering cramps.
"At one point in time, we only had two," Harbaugh said. "Cary cramped up. So we had to run [safety] Haruki [Nakamura], and he jumped into the nickel there, and the other two guys played outside. Having that kind of versatility, I think that's really a credit to our players and to our coaches. Most of those guys on the back end can play every position. The younger guys are still learning how to do that, but when you've got guys that can play inside and outside, high or low as safeties, that kind of versatility is huge in a game like that when you start losing guys. And it seems like you lose guys at the same position at times in games. For those guys to step up and do what they did is pretty important."