NEW YORK — Shortstop Francisco Lindor said he “should be back” before the regular season ends after an MRI exam on his lower back Monday revealed no structural damage, a huge relief for a New York Mets club jockeying for a playoff spot with less than two weeks remaining.

Lindor said he should start physical activity Tuesday or Wednesday, depending on how his back feels. He estimated he could return to the Mets’ lineup in the next two to five days. He said he assumes he will have to manage and tolerate pain whenever he does return.

Lindor said the expectation was he would need a shot for the pain, but doctors decided it wasn’t necessary. He was instead prescribed pain medication.

“We’ll see how I wake up [Tuesday],” Lindor said. “If the trainers allow me to move, I’m going to come in and force their hands. But I respect their decision. I respect the way they go about things. We have one of the best training staffs in the league, so I’ll listen to their input.”

Without Lindor, the Mets turned to Jose Iglesias both at shortstop and in the leadoff spot in Monday’s series opener against the Washington Nationals. The 34-year-old veteran answered by continuing his astounding rebound campaign, going 2-for-4 with a two-out, RBI infield single in the eighth inning to tie the game. Two innings later, Starling Marte, who entered as a pinch hitter in the eighth, delivered the Mets’ 11th walk-off win of the season in a 2-1 decision.

Coupled with the Atlanta Braves‘ loss to the Los Angeles Dodgers, the Mets have a one-game lead for the final National League wild card with 12 games remaining.

“It was a great team win,” said Iglesias, who didn’t play in the majors in 2023 and is batting .323 in 220 at-bats since getting called up from Triple-A in late May. “It was pretty special.”

How much longer the Mets will be without their leader for this all-important stretch remains unclear.

Lindor said back pain has hindered him in recent weeks, but it didn’t impact his availability until the Mets’ series at the Philadelphia Phillies over the weekend. The discomfort forced him to leave Friday’s series opener early. He then missed Saturday’s game entirely — the first time he didn’t appear in a game this season. He led off Sunday’s game with a single, but he exited the game in the second inning. The Mets lost Saturday and Sunday after a blowout win Friday.

Lindor, 30, said he does not believe playing in Sunday’s game worsened the injury.

“I don’t think so because I felt fine,” Lindor said. “I felt good. It wasn’t like a freak accident where I just fell and [got] reinjured. It just got tight on me. So, I don’t think yesterday’s situation put me back. Next thing you know, I didn’t feel comfortable enough to stay on the field. When I can’t do what I love the most, which is play defense, that’s when I said something. I was a little timid taking ground balls.”

Lindor has been the engine in the club’s improbable turnaround from 11 games under .500 in late May as its leadoff hitter and defensive captain. Despite a woeful start to the season, which coaxed boos from home crowds, Lindor is batting .271 with 31 home runs, 27 stolen bases and an .836 OPS in 148 games while playing elite defense.

The consistent all-around performance, which has produced the highest fWAR and third-highest bWAR in the National League, spurred debate about Lindor possibly challenging Dodgers designated hitter Shohei Ohtani for NL MVP. But Ohtani was always considered the runaway favorite, and Lindor’s setback will all but squash his slim chances.

It could have been much worse. That’s what Mets manager Carlos Mendoza feared.

Lindor had missed six games over the past three seasons before not playing Saturday. For Lindor to not play Saturday and remove himself from Sunday’s game, Mendoza thought, it must have been a serious injury, the type of development that would have shattered the Mets’ season less than two weeks until the playoffs begin. But that didn’t happen. So, the Mets still have hope of not just reaching the postseason but of a deep October run with their best player on the field.

“I think we got the best news,” Mendoza said.