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Detroit — Lions cornerback Rashean Mathis exited the fourth quarter of Sunday’s loss to the Vikings after suffering a concussion.

Coach Jim Caldwell didn’t explicitly say Mathis suffered a brain injury, but the team prevented him from speaking with the media after the 28-19 loss, which teams do when a player has a concussion.

“I know he’s in the protocol, so we’ll see,” Caldwell said.

Teams often reference the NFL’s return-to-play protocol in discussing concussions. That same protocol helped lead to fellow cornerback Josh Wilson being inactive for the game after suffering one at some point last week.

Mathis left with an injury on a tackle of running back Adrian Peterson in the first quarter, but returned after missing just a few plays. Trainers appeared to give him the concussion test after the early injury, but he played the majority of the snaps after doctors cleared him.

Although Wilson likely will be back next week, losing Mathis would be tough to overcome as he’s started 36 games for the Lions the past three seasons.

jkatzenstein@detroitnews.com

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