DENVER (AP) - Cleveland Browns cornerback Sheldon Brown left the game with a head injury after colliding with Broncos receiver Brandon Stokley late in the second quarter Sunday.

Brown was trying to cover Demaryius Thomas over the middle of the field when he bumped into Stokley, who drew an offensive pass interference penalty. Brown stayed down before being helped to the bench.

Broncos cornerback Tracy Porter left with a concussion in the first quarter. Porter was banged up when he hit Josh Gordon after the Browns receiver caught a pass for a short gain.

This was Porter's first game back since Oct. 7 and he lasted only three plays. He has missed nine straight games after experiencing symptoms similar to those he had last summer that preceded a seizure.