Carlos Mendoza is staying put, but his lieutenants are paying the price for the epic collapse by the Mets.

The organization is saying goodbye to pitching coach Jeremy Hefner, hitting coaches Eric Chavez and Jeremy Barnes, bench coach John Gibbons and third base coach Mike Sarbaugh.

The Mets are firing Chavez and Barnes, as each has one year remaining on his contract. They are declining to pick up Hefner’s 2026 option, while Sarbaugh’s contract is expiring at the end of this month, and the team is not re-signing him to a new deal. Gibbons resigned.

Assistant pitching coach Desi Druschel and bullpen coach José Rosado were also given permission to speak to other organizations.

The departures serve as the primary casualties for the high-priced Mets finishing with only 83 wins and inexplicably missing the playoffs after losing a tiebreaker to the Reds for the final wild-card spot.

Thus, Mendoza will have an almost completely revamped coaching staff for 2026. The only ones to survive the purge were first base/baserunning coach Antoan Richardson, strategy coach Danny Barnes and assistant Rafael Fernandez.

Additionally, earlier this week, catching instructor Glenn Sherlock retired.

“It’s time for a new adventure, see where baseball takes me,” Gibbons told The Post’s Mike Puma in a text message. “Time for a fresh face in that job. Mendy and [David] Stearns are the real deal and the team is in great hands.”

Jeremy Hefner is out as Mets pitching coach. Corey Sipkin for the NY POST

Chavez confirmed he was out of the job as well on his Instagram Story.

“So thankful for my time w the Mets,” Chavez posted. “Thank you to the Cohen’s [sic]. Best owners in baseball. And especially the players. That group is super special and they worked their asses off. Be grateful in every situation. On to the next.”

The 39-year-old Hefner is the most notable exit among the coaches, as he had served as pitching coach since 2020, initially hired for — here’s one — Carlos Beltran’s coaching staff. After Beltran’s departure soon after that — a result of the Astros’ sign-stealing scandal — Hefner then worked under managers Luis Rojas, Buck Showalter and Mendoza.

Eric Chavez is out as Mets hitting coach. USA TODAY Sports

Hefner enjoyed great success particularly with the 2024 reclamation of Luis Severino and emergence of Sean Manaea. And during the opening portion of the 2025 season, Mets pitching excelled.

But as the season continued, there were significant downturns for key staff members Manaea, Kodai Senga, David Peterson and Ryan Helsley, in particular.

As for Chavez and Barnes, the Mets offense was a supreme disappointment despite elite production from the core quartet of Juan Soto, Francisco Lindor, Pete Alonso and Brandon Nimmo.

John Gibbons is stepping down as Mets bench coach. Corey Sipkin for the NY POST

The Mets averaged 4.73 runs per game this season, ranking sixth among NL teams. While that constituted above league average offensive production, the lineup lacked consistency and certainly underwhelmed compared to expectations.

Also, the performances of the team’s young hitters varied — after Mark Vientos’ 2024 breakout, his 2025 cratered. Francisco Alvarez slumped so badly that he was demoted to the minors during the season, though it should be said that upon his return to the majors, he hit superbly (a .921 OPS in 41 games).

It’s also worth noting that Brett Baty emerged offensively in 2025, boosting his OPS from .633 in 2024 to .748 in 2025.

Among those who could be considered for the bench coach opening with the Mets is J.P Arencibia, who filled the same role this season at Triple-A Syracuse.

— Additional reporting by Mike Puma