Brent Grimes isn't comfortable being a football nomad, getting viewed as a hired mercenary at cornerback. But he's coming to terms with what could be his new life in the NFL.

The Dolphins' starting cornerback could be playing his final games in South Florida this month and, if that's the case, he'll pack his stuff and be prepared to move on. The franchise hasn't approached Grimes and his camp about signing an extension during the season, which isn't uncommon.

The Dolphins have a policy against signing players to extensions during the season and rarely make exceptions.

Ricky Williams getting an offer on a Post-it note from Bill Parcells in 2008 was an exception. And so was Davone Bess' extension in October 2010.

Koa Misi signed a four-year, $17 million extension the day before this year's season opener, and from then, Dawn Aponte, the vice president of football administration, has closed the team's checkbook. However, considering how well Grimes has played this season, the organization might need to reconsider opening it for another exception.

"Everybody wishes they had a deal, and they knew what they were going to do, and where they were going to live next year. But I've done a good job of [shutting it out] the whole time and just focused on playing ball," said Grimes, who signed a one-year, $5.5 million deal this offseason. "I like to play football. I'm not sitting and complaining about it. I'm playing the game I love. That's all I can control."

According to Grimes, working on an extension is what his agent controls. And when the time comes, he'll focus on the business end of football. Despite suffering a minor groin injury in Sunday's win over the Patriots, Grimes insists this isn't the time.

Based on the season he's had, Grimes will likely have an opportunity to break the bank this offseason, either as an unrestricted free agent or as a result of the franchise tag.

"The film, his history in the league as you study him, will tell you that he plays big," Dolphins coach Joe Philbin said of the 5-foot-10, 190-pound cornerback. "On the measuring stick he's not the tallest guy, but he plays hard, he's got those instincts that's sometimes hard to instruct guys with and coach up. He loves to compete."

Profootballfocus.com ranks Grimes the NFL's fourth-best cornerback heading into this weekend's games, and he's never dropped out of the top 10. Opposing quarterbacks have a 65.9 passer rating when throwing to receivers he's covering. Grimes' 13 pass deflections ties him for the NFL lead by a cornerback. And he's also pulled down four interceptions.