McKinnie, who had been placed on the reserve/did not report list, was reinstated when he got to town. But because of the nature of his absence, he was reportedly placed on the non-football injury list.
Ravens coach John Harbaugh told reporters Monday that McKinnie strained a muscle in his back, adding that he thought McKinnie said he fell.
Harbaugh believes that McKinnie still has a chance to be a part of the team. The 10-year-veteran had been expected to start at left tackle, as he did a year ago.
But before McKinnie reported, Michael Oher had been taking snaps at left tackle.
"My first thought right now is going to be competition. We are going to put the best five guys out there, and it has become a competition," Harbaugh told reporters. "It's not ideal in the sense that I'd love for Mike to be settled on one side or the other, but by the same token, that's what it is. We're going to play our best five guys."
No matter what happens with McKinnie going forward, at least the uncertainty surrounding whether he'd come to camp at all is over.
"Well, it's great to see him. It was great to see him and talk to him and visit. That was great," Harbaugh told reporters.
"He came in yesterday. He started the process of getting his physical finished up this morning. He and I had a long conversation, a very good conversation. Like I've said many times, I think the world of 'B-Mac.' I do believe he is a hard worker. I do believe he has been working hard, but he is not ready to practice yet. When he is ready to practice, he'll be out there."
The Ravens did lose a key piece for the time being, as Pitta suffered a broken hand. The 27-year-old contributed 40 receptions for 405 yards and three touchdowns in a breakout 2011 season.
When meeting with reporters, Harbaugh wasn't sure about how long Pitta would be out and what comes next for him.
"It looks like he'll have to get it repaired in some form or fashion. (He) should be back for the first regular season game. But that's very tentative, and I'm a little ahead of myself there," Harbaugh said.
Asked to clarify how long Pitta might be sidelined, Harbaugh told reporters, "I shouldn't really say because I really don't know. But it's not going to be that long. Tomorrow, we could find out it's different because of the MRI, so I probably shouldn't have said anything."
Davon Drew filled in at tight end after Pitta left practice.
"Davon seemed like he did well, just watching of the field. I'll have to watch the tape. It seemed like he did all right," Harbaugh said.
Harbaugh also provided the reporters in attendance with a couple of other injury updates. Haloti Ngata (hamstring) is making strides, but will have to pass his conditioning test. Pernell McPhee (knee) is getting closer, working on lateral movement. While there's no timetable, Harbaugh is hoping he'll be ready for the first preseason game.