Smith, the organization's first-round pick out of Colorado, got hurt while covering a kickoff in the first quarter of the team's 35-7 victory over the Pittsburgh Steelers.
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"Jimmy is the one guy that had an injury that was something a little more serious," said Harbaugh, who said that Smith got caught up in a pile while covering the kick. "He's in a boot, he's on crutches, he had an MRI. He does have a high ankle sprain. That's going to be a few weeks. We'll just have to see how that plays out. Hopefully, he's a quick healer, but that was a tough one."
The injuries to Smith and Chris Carr (hamstring) left the secondary 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."
Harbaugh: Carr's hamstring is not torn
With Smith on the mend for at least a few weeks, the defense could use a healthy and effective Carr.
Carr left the second quarter after re-aggravating the left hamstring injury that has been nagging him throughout the preseason. Carr did not return for the second half, but Harbaugh said the hamstring is intact.
"The good news is it's not a tear," Harbaugh said. "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."
D.Reed rejoins team
Harbaugh confirmed that wide receiver and kick returner David Reed rejoined the Ravens for their walk through on Monday after serving a one-game suspension for violating the NFL's substance-abuse policy.
The return of Reed means that the organization must waive someone from the roster. The plan has been to possibly get rookie defensive end Michael McAdoo through waivers and sign him to the practice squad, but Harbaugh sounded as if that plan was still in a state of flux.
"We'll make a roster move, and I think it will involve Michael," he said. "That'll be the plan. We'll have to see. There's some issues going on right now that I'm not at liberty to divulge, but there'll be some sort of move."
Despite Haloti Ngata's performance of four tackles, two recovered fumbles, one sack and one tipped pass on Sunday, Harbaugh said he did not have any details on the current state of negotiations between the team and the defensive tackle in his quest for a long-term contract with the organization. "No, I stay out of that," he said with a laugh. "I've done as much as I can do. I'm on record: I've already done as much as I can do. The pressure's on. I said we want Haloti way back when. I happen to be very good friends with Haloti's agent [Mike McCartney] and of course very good friends with [general manager] Ozzie [Newsome] and [team owner] Steve [Bisciotti]. So I'm pulling for both sides." ... One of the few hiccups the Ravens endured on Sunday was a failed attempt for a first down on fourth-and-1 from Pittsburgh's 8-yard line in the third quarter. Harbaugh acknowledged on Monday that the decision to go for it was rooted in emotion rather than reason. "Sometimes you go with your head and sometimes you go with your heart, and the second decision [to go for it] was probably going with my heart," he said. "I felt like we were going to get it. I felt like we could get it and I felt like we could really put the nail in the coffin. Twenty-five [points] is better than 22, but 29 is better than 25. How much is enough? It was just a little bit more."