BEREA, Ohio (AP) Browns starting nickel back K'Waun Williams has a concussion - his third in two seasons - and will miss the game Sunday against Oakland.

Coach Mike Pettine said Friday that Williams has been placed in the NFL's protocol on concussions after complaining about headaches. The Browns don't know when Williams sustained his head injury. He practiced the past two days and was not listed on the injury report earlier this week.

With Williams out, right cornerback Tramon Williams will likely move into the slot when the Raiders have three wide receivers and Pierre Desir will play outside. Oakland receivers Michael Crabtree and Amari Cooper each had more than 100 yards receiving last week in a win over Baltimore.

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Also, cornerback Justin Gilbert (hamstring) and defensive end Desmond Bryant (shoulder) are questionable for Sunday's game.

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