
Amari Cooper already entered the Oakland Raiders’ Week 14 game against the Kansas City Chiefs with an ankle injury, and he appeared to re-injure his ankle in the second quarter on Sunday.
Cooper was trying to run block on a play when he went down and began rolling around on the ground in pain. Cooper exited the game and had his ankle examined by trainers.
Amari Cooper on the sidelines having his left ankle looked at by trainers … #OAKvsKC pic.twitter.com/7gRIrAz3BR
— Raiders on NBCS (@NBCSRaiders) December 10, 2017

Cooper was concussed and suffered a sprained ankle in Week 12, and he missed the team’s game in Week 13. He returned to action for Sunday’s game, but obviously he wasn’t anywhere close to being at full strength.