Justin Tuck doesn’t have his heart set on retiring a Giant anymore.

In comments to The Post on Thursday morning, the veteran defensive end guaranteed he would become an unrestricted free agent when the league-wide market opens March 11.

Re-signing with Big Blue before then now appears to be out of the question.

“I will see what the market is for me,” Tuck said during a Super Bowl promotional appearance. “I’ve never been in this situation before, and it’s a great opportunity for myself. I would be doing myself a disservice if I didn’t see what the market is, and I will.”

That sounded like a far different cry from the one that came from Tuck at the end of the Giants’ 7-9 season in December, when he said he would “love to retire as a Giant” and was hopeful the two sides “would be able to make something happen” in the offseason.

Tuck, who turns 31 in late March, said he plans to grant the Giants’ recent request for a face-to-face meeting next month to discuss returning, but described it as more of a courtesy because of all the difficult decisions the cap-strapped team faces this offseason.