INDIANAPOLIS -- Eagles cornerback Patrick Robinson emerged as one of the top slot cornerbacks in the NFL last season, and the team is looking to ensure that he does not hit the open market when free agency begins.

According to a source with knowledge of the situation, Robinson and the Eagles have begun talks about a long-term extension that would keep him in an Eagles uniform long-term prior to the start of the new league year, when other teams can bid openly for the veteran's services.

Talks between the Eagles and Robinson have been ongoing, but other teams could be in the mix if a deal is not reached prior to the new league year opening on March 14.

The individual spoke to NJ Advance Media on the condition of anonymity, because he is not authorized to speak publicly about the negotiations.

In his lone season with the Eagles, Robinson played 68.9 percent of the Eagles' defensive snaps, second among cornerbacks to Jalen Mills. In addition to his dominance in the slot, Robinson showed the versatility to also play outside when called upon throughout the season.

Robinson thrived after moving to the nickel cornerback and emerged as one of the leaders in the locker room while finishing the season with 47 tackles, 1.0 sack, and four interceptions.

The highlight of Robinson's lone season with the Eagles after signing a one-year deal last spring, was an interception returned for a touchdown against the Minnesota Vikings in the NFC Championship Game.

Up until the new league year begins, and free agency gets underway, the Eagles have exclusive negotiating rights with Robinson.

Given the way that teams now play defense across the league, slot cornerbacks are now essentially starters in most schemes, which should boost Robinson's value if he hits the open market.

The Eagles are currently $9.66 million over the projected salary cap, which could present a challenge for executive vice president of football operations Howie Roseman, as he looks to lock up valuable contributors to long-term deals.

Matt Lombardo may be reached at MLombardo@njadvancemedia.com. Follow him on Twitter @MattLombardoPHL.