The revelation came a day after the 10-year journeyman led Buffalo (9-7) to a season-ending 17-9 win at New England,
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With a 42-40 record as a starter, Orton was Chicago's fourth-round pick in 2005, and also played in Denver and Kansas City.
It won't happen without competition with Whaley saying he intends to add potentially two quarterbacks this offseason.
Receiver Robert Woods said Orton had hinted at the possibility of retiring in recent weeks.
Had Marrone known about Orton's plans, the coach would have reconsidered his decision to start the veteran over Manuel in the finale with the Bills already eliminated from playoff contention.
The 32-year-old caught the team off guard when he informed coach Doug Marrone of his plans shortly before the Bills held their end-of-season meetings.
Marrone was so surprised by Orton's decision that he initially asked the quarterback to reconsider.
Initially brought in to mentor EJ Manuel,
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"He'd talk about it here and there, just joking around, 'It's my last get-around,
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Orton was already contemplating retirement in mid-July when he was cut by the Dallas Cowboys after failing to attend the team's spring minicamps,
Cheap NFL Jerseys China. The Bills signed him to a two-year contract with a little more than a week before the start of the season.
Manuel has two years left on his contract. The 2013 first-round pick's future as the team's long-term starter, however, remains in question after he was benched.
Orton's addition was a stop-gap measure. And yet the Bills were looking forward to seeing the benefit Orton would get by having an entire offseason to better learn the offensive system.
Minus Orton, the Bills are left with two quarterbacks, Manuel and Jeff Tuel, who spent the entire season on the practice squad.
Orton declined to speak to reporters while making a brief appearance at his locker,
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By electing to retire, Orton passes up a chance to make a $5.4 million base salary he was due next year after making $2.5 million this season.
NOTES: Tuel was one of 10 players the Bills signed to reserve/future contracts on Monday. Also signed were WRs Caleb Holley and Tobais Palmer, DLs Bryan Johnson and Jeremy Towns, OLs William Campbell and D.J. Morrell, linebacker Jimmy Gaines, cornerback Rod Sweeting and safety Deon Broomfield.
ORCHARD PARK, N.Y. (AP)