Kansas City, MO (Sports Network) - Kansas City Chiefs quarterback Matt Cassel left Sunday's game against the Baltimore Ravens with a head injury.
In the fourth quarter, Cassel was hit by two Baltimore players on a pass play and laid on the ground for several minutes.
He eventually walked to the sideline and went into the locker room. Brady Quinn took over under center for the Chiefs.
Cassel had been having a tough day as he was picked off twice and also lost a fumble. He was 9-for-15 with 92 yards and also had 14 yards on four carries.