Tight end Trey Burton played an integral role in the Eagles' Super Bowl LII victory over the New England Patriots, tossing a historic touchdown pass to Nick Foles on the "Philly Special" play, but he could play elsewhere in 2018.

The Eagles have made an offer that Burton "didn't consider serious," and unless the offer is sweetened, Burton likely will sign with another team, a person with knowledge of the negotiations told NJ Advance Media.

The Eagles are roughly $9.6 million above the salary cap, heading into free agency. Burton could be the top tight end available, so, it could be difficult for the Eagles to retain him.

"We are fully expecting Trey to sign elsewhere," said the person, who requested anonymity because the person was not authorized to speak publicly about the contract talks.

Last season, Burton caught 23 passes for 248 yards and a career-high five touchdowns in 15 games, playing behind Pro Bowler Zach Ertz on the Eagles' depth chart.

Burton, an undrafted free agent, made one start in 2017 and saw his snaps increase while Ertz recovered from a concussion suffered in Week 13 against the Seattle Seahawks.

In four seasons with the Eagles, Burton has accounted for 63 catches for 629 yards and six touchdowns.

The Eagles will need to address tight end via free agency or the draft, with Brent Celek's possible retirement and Burton's potential departure.

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