The Browns trailed 31-7 when Mayfield left, and backup Case Keenum finished the game.
Coach Kevin Stefanski said Mayfield could’ve returned in the fourth quarter had the game’s outcome been in doubt.
X-rays taken immediately after the game revealed no structural damage, but Mayfield said the hit caught a nerve that caused his knee to temporarily go numb. Mayfield currently ranks 25th in the league with a 42.9 QBR.
“I have to adapt; nobody is going to feel bad for you,” Mayfield said of the injuries.