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

"[He] reported some kind of symptoms in regards to his head, and we wanted to get back here once we kind of heard he was evaluated last night," O'Connell said of McCarthy. "After completing those tests, our training staff and doctors and medical team have decided that the right place for him is to put him in the protocol for now."

Minnesota fell to 4-7 after Sunday's 23-6 loss to the Green Bay Packers . The Vikings spent the first half relying on running backs Jordan Mason and Aaron Jones to lead a ball-control attack, but when they needed McCarthy, Minnesota couldn't handle the Packers' pass rush.

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