The Saints have placed Carr in the concussion protocol following Sunday's 33-28 loss to the Lions, Ian Rapoport of NFL Network reports.
Carr was carted off the field during Sunday's loss, and in addition to sustaining a concussion he was evaluated for back and shoulder injuries. This is his second time in the concussion protocol in a three-game span, a fact that casts significant doubt on his chances of returning to the lineup in time to take on the Panthers in Week 14. Jameis Winston would be in line to start for New Orleans if Carr misses time.