Peyton Manning played the past month of the season and the Denver Broncos' playoff loss on Sunday with a torn quad.

Manning initially injured his thigh when he rolled out right to throw a 12-yard completion to Emmanuel Sanders late in the first half of Denver's Dec. 14 win over the San Diego Chargers.

Broncos doctors knew about the injury, and Manning did what he could to intentionally conceal the injury from as many people as he could, sources said.