Williams moved into the starting lineup two games ago following a number of injuries. After practicing in full Thursday, he apparently suffered a setback Friday when he was listed as limited. The Panthers on Saturday moved Williams from questionable to out on their injury report.
Williams' backup, Nic Harris, also is out with a head injury. That leaves Jordan Senn and Abdul Hodge as candidates to start Sunday.
Starting middle linebacker Jon Beason also is questionable with a sore knee. He practiced on a limited basis Friday.
Copyright 2010 by The Associated Press