Rookie OLB Brandon Williams will miss the season with a torn ACL.
Williams was injured while trying to make a tackle on a punt return in Dallas' 30-10 victory over Tennessee on Friday night. Victor Butler will replace Williams as the primary backup on the strong side.
Steve Octavien also is likely to move up in the rotation.
Also, third-string quarterback Stephen McGee sprained a knee while throwing a late touchdown pass and may miss about a week. Inside linebacker Justin Rogers aggravated a knee problem and may miss a week as well.
Hat tip to TennKen for the FanShot.