The Steelers may have to complete their heated rivalry game against the Baltimore Ravens without their star wide receiver.
Pittsburgh's Antonio Brown left Thursday's game in the first quarter. He went to the team's locker room to be evaluated for a possible concussion. His return is questionable.
On the Steelers' first drive, Brown went across the middle and was hit by Ravens safety Darian Stewart after making a catch.
UPDATE: Brown returned to the game in the second quarter.