Raiders QB Jason Campbell left Saturday night's game against the 49ers with a possible concussion, according to a report by Yahoo! Sports.
While scrambling on a play late in the second quarter, Campbell lost the ball and then was hit by DL Justin Smith and LB Ahmad Brooks as he fell to the ground in an effort to recover his fumble.
"I tried to go dive on it and caught a knee to the head," Campbell said. "We just have to run some tests and make sure it's not a concussion."
Campbell sat on the bench the remainder of the first half but didn't return to the field in the second half. He was expected to undergo tests Saturday night to determine whether he had suffered a concussion.
Campbell said he has had a slight concussion once before.