** FILE ** In this Dec. 11, 2011 file photo, Denver Broncos quarterback Tim Tebow prays in the end zone before the start of an NFL game against the Chicago Bears, in Denver. Peyton Manning has joined the Broncos. The addition of Manning could well lead to Denver trading Tebow, even though the popular QB energized the Broncos in leading them to the playoffs last season despite some uneven play. (AP Photo/Julie Jacobson, File)

** FILE ** In this Dec. 11, 2011 file photo, Denver Broncos quarterback Tim Tebow prays in the end zone before the start of an NFL game against the Chicago Bears, in Denver. Peyton Manning has joined the Broncos. The addition of Manning could well lead to Denver trading Tebow, even though the popular QB energized the Broncos in leading them to the playoffs last season despite some uneven play. (AP Photo/Julie Jacobson, File)