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.
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.
McCarthy went 12 of 19 for 87 yards and had interceptions on the final two series.
With a 24.9 QBR after six starts, McCarthy is off to one of the worst career starts of any NFL quarterback in the past decade.
Max Brosmer will work with the first team while McCarthy remains in the protocol, but O'Connell isn't ready to say that McCarthy is out for Sunday's game against the Seattle Seahawks.
ESPN's Kevin Seifert and The Associated Press contributed to this report.
