C.J. Anderson will undergo surgery to determine the extent of damage to the meniscus in his right knee.

Anderson is out indefinitely.

Whether Anderson has a full or partial tear in the meniscus will be determined during the arthroscopic procedure, and a repair could be made. A full tear would almost surely end his season, and a partial tear could mean a four- or five-week absence.

Anderson suffered the injury during an 11-yard run on the last play of the first quarter of the Broncos' 27-9 victory over the Houston Texans Monday night.