Peyton Manning

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Denver's Peyton Manning draws one the NFL's top defenses in his first game with his new team. (Associated Press)

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Before his first formal workout with the Broncos, quarterback Peyton Manning was throwing passes to receivers Erick Decker and Brandon Stokley at Denver-area high schools. (Associated Press)

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** FILE ** In this Sept. 26, 2010, file photo, Indianapolis Colts quarterback Peyton Manning (18) greets Denver Broncos quarterback Tim Tebow (15) at an NFL game, in Denver. (AP Photo/Greg Trott)

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associated press Quarterback Peyton Manning (left) and Broncos vice president John Elway show off Manning's new jersey during a news conference at team headquarters in Englewood, Colo. Manning agreed to a five-year, $96 million contract.

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New Denver Broncos quarterback Peyton Manning, center, is flanked by Broncos owner Pat Bowlin, left, and vice president John Elway during a news conference at the Broncos headquarters in Englewood, Colo., on Tuesday, March 20, 2012. (AP Photo/Ed Andrieski)

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**FILE** Indianapolis Colts quarterback Peyton Manning (18) greets Denver Broncos quarterback Tim Tebow before the Colts' 27-13 win in Denver on Sept. 26, 2010. (Associated Press)

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NFL football quarterback Peyton Manning, right, leaves the offices of the Tennessee Titans with Titans head coach Mike Munchak, front left, Wednesday, March 14, 2012, in Nashville, Tenn. (AP Photo/The Tennessean, Sanford Myers) NO SALES

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Quarterback Peyton Manning pays a visit to the Arizona Cardinals Training Facility in Tempe, Ariz., Sunday March 11, 2012. Manning is searching for a new team. (AP Photo/The Arizona Republic, Cheryl Evans)

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Quarterback Peyton Manning is the biggest free agent on the market this NFL offseason. (Associated Press)

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NFL quarterback Peyton Manning (left) takes a tour March 9, 2012, with John Elway, executive vice president of football operations for the Denver Broncos, and Broncos coach John Fox at the team's training facility in Englewood, Colo. (Associated Press/The Denver Post)

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Quarterback Peyton Manning missed the entire 2011 season with a damaged nerve that caused weakness in his right arm and required multiple neck surgeries, including a single-level fusion. (AP Photo/AJ Mast, File)

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Quarterback Peyton Manning was released by the Indianapolis Colts on Wednesday, March 7, 2012. Manning, 35, who missed all of last season after a series of operations on his neck, has been the starting quarterback for 13 seasons, won a record four MVP's and the 2006 Super Bowl. (AP Photo/Michael Conroy)

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Quarterback Peyton Manning collects his thoughts as speaks March 7, 2012, during a news conference in Indianapolis. Manning's record-breaking run as quarterback of the Indianapolis Colts ended when team owner Jim Irsay announced during the press conference that the team would release him. (Associated Press)

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FILE - In this Feb. 7, 2010, file photo, Indianapolis Colts quarterback Peyton Manning (18) walks off the field after the NFL Super Bowl XLIV football game against the New Orleans Saints in Miami. The Peyton Manning era in Indianapolis is expected to end, according to a report. Citing anonymous sources, ESPN reported Tuesday, March 7, 2012, that the Colts plan to hold a news conference Wednesday to announce the long-expected decision. Manning is expected to attend. (AP Photo/Mike Groll, File)

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Quarterback Peyton Manning has been willing to give his time, money and — in this instance, his signature — to the people of Indianapolis. Drafted first overall in 1998, Manning helped shape the Colts into an NFL power for more than a decade. (Associated Press)

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Colts quarterback Peyton Manning has been a civic icon as well as a four-time NFL MVP. His charitable deeds range from hospital projects to working with students during Super Bowl festivities in Indianapolis. Yet the Hall of Famer-in-waiting may have played his last game at Lucas Oil Stadium. (Associated Press)