Cook (ankle) is listed as questionable for Sunday's game against the Jaguars.
Cook injured his ankle during the Bengals' Week 3 loss to the Steelers, though he was able to return to that contest. He was a limited participant in all three practices during Week 4 prep, and if he's unable to play against Jacksonville, then PJ Jules would likely start at safety alongside Jordan Battle, seeing as Kyle Dugger (quadriceps) has already been ruled out.