An MRI exam shows Tennessee Titans quarterback Marcus Mariota sprained his left medial collateral ligament (MCL), and coach Ken Whisenhunt says they will have to see how the rookie’s knee progresses before determining if he can play Sunday against Atlanta.

Whisenhunt said that Mariota was walking around just fine at the Tennessee headquarters on Monday.

“From what I have seen of him walking around today, he is moving around fine,’’ Whisenhunt said. “We have to see it on the field to be able to see what he can do.

“We are not going to do anything to put him in any kind of jeopardy. That will be determined with how he progresses during the week.”

Mariota was injured during the second quarter of Sunday’s 38-10 loss to the Miami Dolphins when hit low by end Olivier Vernon. The rookie stayed on the field and didn’t miss a play.

Mariota did put a brace after the series, and he remained in the game until Whisenhunt sent Zach Mettenberger in for the final series with 1:54 left.

Kickoff between the Titans and Atlanta Falcons is set for Sunday at 7 a.m. HST on KHON2.