But according to the Bergen (N.J.) Record, that decision already has been made for him.
A source told the Record that Diehl will move from left tackle to left guard, a move that will cost him $750,000. According to the newspaper, when the Giants ripped up his old deal and gave Diehl a new six-year, $31 million contract in 2008, it included an annual escalator clause that increased his salary between $750,000 and $1 million as long as he played tackle.
Diehl declined comment when contacted by ESPNNewYork.com
Will Beatty, 26, the Giants' second-round pick in 2009, is the likely candidate to step into the left tackle position.
"I really don't know (what position I'm going to play) until I come in (Friday)," Diehl said Thursday in Times Square, where he was participating in a fantasy draft with SiriusXM Radio. "But I've always been a team guy. I've always been a team player and I'm always gonna be a guy that does what's best for this football team."
Moving Diehl to left guard doesn't come as a surprise. He started two games at left guard last year when injuries forced the Giants to shuffle their linemen. And according to sources, the Giants will release center Shaun O'Hara, left guard Rich Seubert and left tackle Shawn Andrews in an effort to save money so they can attempt to re-sign free-agent running back Ahmad Bradshaw, defensive end Mathias Kiwanuka, wide receiver Steve Smith and tight end Kevin Boss, among others.
The Giants agreed to terms, sources said, with O'Hara's potential replacement at center, David Baas, who started last year at center for the 49ers. The Giants still could sign another offensive lineman but the starting line potentially could have Beatty at left tackle, Diehl at left guard, Baas at center, Chris Snee at right guard and Kareem McKenzie at right tackle.
"It's funny, after I talked to Rich (on Wednesday), he said to me, 'Well, I'm handing it down.' Now I'm the longest-tenured Giant on the team going into my ninth year," Diehl said. "So I'm taking a lot of pride in that. I'm gonna come back and be one of the great leaders on our team, be vocal and lead by example.
"I believe in (offensive line) coach (Pat) Flaherty that he's going to put the best guys on the field," Diehl said. "And like I said, I'm gonna play wherever I gotta play to win football games and do whatever I can to get another Super Bowl trophy for our team."
The 30-year-old Diehl, who was named to the Pro Bowl in 2009, played guard and tackle for the Giants last season, sometimes sliding over and playing inside, which allowed Andrews to play left tackle.
In his career, Diehl has played and started 124 out of a possible 128 games.
Beatty played just eight games and made two starts at left tackle in 2010 after breaking his right foot.
Mike Mazzeo is a frequent contributor to ESPNNewYork.com.