- Associated Press - Friday, March 16, 2012

RALEIGH, N.C. (AP) - Peyton Manning won’t be a Dolphin or a Cardinal. But he could still join the Titans, the Broncos or even _ get ready for this _ the 49ers.

The race to sign the NFL’s only four-time MVP and the most prized free agent of the offseason heated up Friday as Denver Broncos executive John Elway and coach John Fox watched the star quarterback throw at Duke and San Francisco was revealed as a stealth suitor.

A person familiar with the situation said that Manning worked out for 49ers' coach Jim Harbaugh on Tuesday night at Duke. ESPN first reported on the session.

Manning also threw the ball at Duke’s athletic fields Friday afternoon for the Broncos. He was seen leaving the Blue Devils’ indoor practice facility wearing blue shorts, a gray t-shirt and no helmet heading to the outdoor practice field followed by Elway and Fox.

Manning came off the field about 4 p.m., and the Broncos contingent left about the same time.

“We enjoyed visiting with Peyton today in N.C.,” Elway tweeted later. “He threw the ball great and looked very comfortable out there.”

Another person confirmed to the AP that Manning phoned the Miami Dolphins on Thursday to advise them he’ll sign elsewhere. The team has now turned its attention to free agent quarterback Matt Flynn.

The people who spoke to the AP did so on condition of anonymity because Manning’s workouts have remained private and all the teams involved have refused to comment about their free agency negotiations.

The record-setting quarterback has been rehabilitating in North Carolina after a series of neck surgeries. Duke coach and longtime Manning friend David Cutcliffe told The Tennessean that Manning has made good progress throwing the football following the operations, which forced him to miss the entire 2011 season.

Manning’s uncertain health led the Indianapolis Colts to balk at paying a $28 million roster bonus to the 35-year-old quarterback. The colts released Manning on March 7, which in turn triggered a flurry of meetings and visits.

The 49ers had been working to re-sign quarterback Alex Smith, the No. 1 overall draft pick in 2005 who made a comeback in 2011 under first-year coach and former NFL QB Harbaugh, and Smith has acknowledged he was happy with the three-year offer.

Smith and Manning both are represented by Tom Condon and CAA Sports.

“Alex is trying to figure out what he wants to do,” 49ers CEO Jed York said earlier this week. “There have been good conversations back and forth.”

The NFC West champion 49ers on Monday signed wide receiver Randy Moss after he spent a year out of football, hoping he will be the dynamic wideout and deep threat he once was and will open up the field.

An email to Smith, multiple phone messages to his agency and to his father were not returned.

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