The person spoke on the condition of anonymity because coach John Fox hadn't yet addressed the media Monday. The Denver Post first reported the extent of Mays' injury.
Mays was injured while blocking for punt returner Trindon Holliday in the fourth quarter Sunday.
Mays has had a rough season since signing a three-year, $12 million deal in the offseason. He was suspended for a game for an illegal hit on Houston QB Matt Schaub and lost his starting middle linebacker job two weeks ago to veteran Keith Brooking.
(Copyright 2012 The Associated Press. All rights reserved.)