The Detroit Lions have played most of the third quarter here at the Metrodome without defensive end Cliff Avril , who is being evaluated for a possible head injury in the team's locker room. The Lions say he is being evaluated for a possible concussion. Avril suffered the injury on the second play of the quarter and hasn't returned. Lawrence Jackson was getting the bulk of the work in Avril's place. All rights reserved. The Lions' bigger problem at the moment is a lack of points. He made an impact in the first half when he batted a pass by Christian Ponder back into the quarterback's arms and tackled him for a 15-yard loss.