Jets inside linebacker C.J. Mosley during the first half against the...

Jets inside linebacker C.J. Mosley during the first half against the  Patriots on Oct. 21 at MetLife Stadium. Credit: Lee S. Weissman/Lee S. Weissman

C.J. Mosley will be sidelined another five to six weeks because of his groin injury, and it’s possible that his first season as a Jet is over.

Adam Gase said Mosley will stay on the roster instead of going on injured reserve. The inside linebacker’s return could depend on whether the Jets are playing for anything.

Although the Jets’ schedule lightens up, they’re 1-6. Even if Mosley is able to return with a few December games left, it’s hard to foresee them being in playoff position at that point.

“For us, it’s better to leave him on the roster, kind of see where we’re at when we get to that point,” Gase said Monday. “See where we are with our season and then make a determination after that.”

As of now, it appears Mosley has avoided surgery. Gase said he is going to “a specialist he trusts and they’re going to try something different than surgery.”

The Jets signed Mosley, a four-time Pro Bowler, to a five-year, $85 million contract to be their defensive leader, but he was injured in the third quarter of their season-opening loss to Buffalo.

Mosley missed four games before returning Oct. 21 against the Patriots, and it was clear he wasn’t himself. He didn’t have the same burst or explosion and was removed from the game.

Gase said the Jets’ doctors did “a really deep dive” on Mosley’s condition last week before coming up with the five- to six-week time frame. Based on that, the earliest Mosley could return is Dec. 8 against the Dolphins.

Sam’s thumb

Sam Darnold sprained his left thumb in Sunday’s 29-15 loss to the Jaguars but expects to be able to play through it.

“It’s just going to be a pain tolerance thing, which I should be fine with,” he said.

More injuries

Center Ryan Kalil, who left Sunday’s game with a knee injury, is week-to-week. Jonotthan Harrison could start at center Sunday against the Dolphins.

Gase hopes to get left guard Kelvin Beachum back from an ankle injury that kept him out of the last two games. He also believes there’s a chance that tight end Chris Herndon will practice Wednesday. He has not played this season because of an NFL-imposed four-week suspension and a hamstring injury.

Mum on Osemele

Gase had nothing to say about the Jets’ decision to waive Kelechi Osemele on Saturday.

“I’m not going to comment on KO,” he said. “He’s not on our team anymore. There’s no need.”

Osemele had shoulder surgery Friday that was unauthorized by the team. The Jets had fined him for not practicing after their doctors said he didn’t need surgery. This matter is not closed. Osemele has filed a grievance with the players’ union.

More Jets