Minnesota Vikings quarterback J.J. McCarthy is going through the league's concussion protocol after reporting symptoms on the trip home from the team's loss to the Green Bay Packers , head coach Kevin O'Connell said Monday.

O'Connell said it's too early to tell what McCarthy's status will be for the team's matchup against the Seattle Seahawks on Sunday, though he admitted it's possible undrafted rookie Max Brosmer will start the game.

"I think we gotta just take it a day at a time and leave it to the medical professionals and the protocol that's in place," O'Connell said.

The head coach said it's not just about clearing the protocol, but also whether McCarthy gets sufficient practice time.

"It's a medical thing first and foremost, and then I do think then at that point, once we

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