The Redskins suffered what could be a major injury in Thursday’s 34-31 loss at Baltimore when rookie defensive end Jarvis Jenkins – one of the most impressive performers in training camp – suffered what the team initially called a sprained knee in the first quarter.

Jenkins, a second-round pick out of Clemson, said he would have an MRI on his right knee Friday morning. He said doctors told him “it feels like my ACL’s a little loose.”

“Hopefully it’s not too bad,” Jenkins said. “I’ve never really had a major injury, so I’ve just got to try to keep a positive attitude about it. And if it so happens that I’ll be out for a while, I’ve just got to stay motivated and get back as soon as I can. I’ve just got to stay positive about it.”

The play occurred during the Ravens’ second offensive possession, when Baltimore had the ball at its own 42. Baltimore running back Ray Rice took a handoff and headed over left guard, with Jenkins watching, trying to get in on the play.

“I was doing a stunt on that side, and I seen the running back cutting back,” Jenkins said. “So when he cut it back, I kind of reacted to him. I had my hands on the lineman trying to throw him. I threw him, and I tried to plant at the same time and redirect, and something just popped.”

Jenkins put some pressure on his right leg as he left the field, but he departed the locker room at M&T Bank Stadium on crutches with a brace on the knee.