Panthers coach Matt Rhule didn't want to discuss if he'd consider benching quarterback Baker Mayfield before next week's game against the Rams, but a left ankle injury could take the decision out of his hands.

Mayfield injured the ankle late in the first half when a player fell on it. He limped into the locker room with 11 seconds left and played most of the second half before former XFL star PJ Walker came on to finish the 37-15 loss to the 49ers that left Carolina with a 1-4 record.

Mayfield was wearing a walking boot when he met with reporters.