The longest-tenured Giants player might be on the way out.

Darius Slayton might not make the cut, The Post has learned.

All summer, it was assumed Slayton would be on the roster, even though he clearly was not moving the same following surgery to repair a sports hernia.

What seemed to protect his place on the team was that he was entering the second year of a three-year, $36 million contract and parting ways with him would be onerous to the Giants’ salary cap.

Well, financial considerations are not going to save Slayton.

If the decision is made that at this point, he cannot contribute to the offense the way John Harbaugh and the new coaching staff envisioned, he will be among the cuts this weekend as the Giants get down to the 53-player limit.

New York Giants wide receiver Darius Slayton speaks with the media during training camp at the Greenbrier on Saturday, August 1, 2026, in White Sulphur Springs, W.Va. Corey Sipkin for the NY POST

It was not a good sign for Slayton that Friday night, in the third and final preseason game, not only did he start but he also was on the field in the second quarter, when backup quarterback Jameis Winston had given way to third-string Brandon Allen.

Harbaugh played it cautiously with almost all of his starters, keeping them on the sideline, but Slayton received a full workload alongside many players who will not be on the squad.

He was on the field for 33 snaps on offense, the same as Odell Beckham Jr., right behind the top-usage wide receivers, Dalen Cambre and Isaiah Hodgins, with 33 snaps apiece.

Slayton had no receptions and was not targeted by either Winston or Allen. Xavier Gipson, who has special teams value (Slayton does not) played 25 snaps and had a 37-yard touchdown catch.

Slayton’s base salary for 2026 is $12.5 million and his salary cap hit is a bloated $15.9 million.

The guaranteed money for this season is $9.7 million and if he is released, the Giants save $3.167 million in non-guaranteed salary, according to OverTheCap.com.

New York Giants wide receiver Darius Slayton (18) runs with the football against Miami Dolphins cornerback Marco Wilson (21) during the first half at Hard Rock Stadium in Miami Gardens, Florida, on Saturday, August 22, 2026. IMAGN IMAGES via Reuters Connect

That would leave a dead cap hit of between $9 and $12 million and that could be decreased if Slayton signs with another team for the veteran minimum of $1.3 million.

Slayton, 29, arrived as a fifth-round pick in the 2019 NFL Draft and has gone through an interesting Giants journey.

He pulled in between 37 and 50 receptions in all seven seasons but had to convince the new Brian Daboll coaching staff in 2022 that he was worth keeping around.

Last season, Slayton in 14 games had only 37 catches and then needed sports hernia surgery in the offseason

He was brought along slowly this spring but was not very productive in training camp.

Last week, in the preseason game in Miami Gardens, Slayton did break out, with four receptions for 58 yards, including a 28-yard pickup as he got open deep against Dolphins backups. That seemed to impress Harbaugh, who had been waiting for Slayton to flash his former form.

“That was big,’’ Harbaugh told The Post after that game. “So big, honestly I needed to see that. Probably other people, everybody probably did. I mean, you have to do it every year, you have to come back and keep doing it. He’s been battling through those injuries so to see him step up like that and make those plays was really good.’’

A few days after that game, free agent signing Calvin Austin III went down with a season-ending torn ACL.

Austin was going to be a big factor in the passing game and his absence left a void in a receiver room that might not include Slayton for the first time since 2019.