Link: https://www.espn.com/nfl/story/_/id/47086594/vikings-put-struggling-jj-mccarthy-concussion-protocol

EAGAN, Minn. -- Minnesota Vikings quarterback J.J. McCarthy has entered the concussion protocol after reporting symptoms on the flight home from Green Bay on Sunday night, coach Kevin O'Connell said Monday.

It is the third injury suffered by McCarthy in his disastrous first season as the Vikings' starter, beginning with a high right ankle sprain in Week 2 and a bruised right hand in Week 10. O'Connell did not rule McCarthy out for Sunday's game at Seattle, but backup Max Brosmer will take first-team reps until McCarthy clears the protocol.

"We'll go through the steps and phases of it," O'Connell said. "I am not ready to make any sort of designation for the game or anything like that. We'll let the process play out, but at the same time, I do think it's important for everybody to know that there is total transparency. I'm going to totally, totally defer to the medical staff and the professionals on that one as well as J.J."