He spent all but two games in 2012 on the physically unable to perform list.

WSJ: Giants take a chance on enigmatic LB Aaron Curry

One other proposal will allow teams to keep players on the physically unable to perform list through Week 11 instead of Week 9.

WSJ: NFL could eliminate tuck rule

Manning entered training camp on the Physically Unable to Perform (PUP ) list, a category reserved for players unable to pass a physical entering camp.

FORBES: The Puzzle Of How The Colts Are Handling Peyton Manning