Add another prominent name to the growing Mets’ injured list.

Luis Robert Jr. (lumbar spine disc herniation) received an epidural Thursday and was placed on the 10-day shelf retroactive to April 27, the team announced before losing 5-4 to the Nationals. He joins Kodai Senga, Francisco Lindor and Jorge Polanco and others on the injured list that also included Juan Soto until recently.

“He’s going to be down 7-10 days, and then we’ll have to reassess,” manager Carlos Mendoza said. “They are telling us it should be a short stint on the IL.”

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Robert was plagued by lower-body injuries throughout his six-year career with the White Sox, and limited to 100 and 110 games over the past two seasons, respectively. He was hitting .224 with a .656 OPS and two home runs (including a walk-off on March 28) over his first 24 games since being traded to the Mets, who tried every safeguard against another injury.

Robert had an MRI exam Wednesday after his back didn’t respond to treatment when the hope was that he was day to day in recovery.

“It’s frustrating for us, and he’s super frustrated,” Mendoza said. “He’s done everything we’re asking him to do. We’re trying to protect him. We give him off days. The ramp-up all the way from spring training. But we have to get him back right.”

The Mets started rookie Carson Benge in center field Thursday for the second time in the past three days. He and last year’s starter, light-hitting slick fielder Tyrone Taylor, will split the time until Robert returns, Mendoza said.

The latest roster flier is infielder Andy Ibáñez, whom the Mets claimed off waivers from the Athletics, The Post’s Joel Sherman confirmed. Ibanez is 2-for-18 this season with a .167 on-base percentage in 11 games.

Most of Ibáñez’s experience is at second base and third base, with a smattering of appearances at first base, shortstop and the corner outfield positions. He has a career OPS of .688 over 1,145 at-bats — mostly with the Tigers and Rangers.

Corner infielder Eric Wagaman was recalled from Triple-A Syracuse to fill Robert’s roster spot. Whether he remains in the majors after Ibáñez reports is yet to be seen.

“That righty bat on the bench, he’s done it before,” Mendoza said. “Knows how to prepare. He’s going to get opportunities.”

The Mets also called up right-handed pitcher Austin Warren and designated pitcher Carl Edwards Jr. for assignment.

Soto was the designated hitter again Thursday for the eighth time in as many games since coming off of the IL. But he is “close” to resuming full-time duty, and Mendoza “wouldn’t be surprised if he is playing in the outfield” during the weekend series in Anaheim, Calif.