Jamaal Charles exited Week 5 with a right knee injury and there is a fear he tore his ACL.

Charles was unable to put weight on the leg as he was helped off the field.

Charles missed all but two games of the 2011 season with a torn ACL.

The Kansas City Chiefs have used Charcandrick West as their backup for Charles. West replaced Knile Davis in that role for the Chiefs early in the season.