The hits keep coming for the Mets — and not just the good kind.

Francisco Alvarez left Tuesday’s 10-2 win over the Tigers at Citi Field with a right knee injury in the bottom of the sixth and will undergo an MRI exam Wednesday.

The catcher was in discomfort following a swing with A.J. Ewing at second base, and after a brief visit from the training staff, Alvarez was removed from the game and replaced by pinch-hitter Luis Torrens, who drew a walk.

“We’ve got to wait to see what we’ve got,’’ Carlos Mendoza said of the injury. “It didn’t look good on the swing. We saw it right away.”

Alvarez, who had cooled off this season, drove in a run and doubled earlier in the game against Detroit right-hander Jack Flaherty.

The Mets already had plenty of injury concerns before Alvarez went down, as Luis Robert Jr., Jorge Polanco and Francisco Lindor are all regulars who are on the injured list.

Robert has been sidelined for two weeks with a lumbar spine disc herniation and isn’t close to returning.

Mets president of baseball operations David Stearns said Tuesday that Robert’s back soreness had “not resolved” and the outfielder was seeing additional specialists.

The Mets traded for Robert in the offseason despite the outfielder’s injury issues the last two seasons with the White Sox and put together a schedule during spring training that they took into the regular season in an attempt to keep him healthy, but it didn’t prevent him from hitting the IL.

“It’s gonna take some time,’’ Carlos Mendoza said of Robert’s return.

Stearns said surgery is so far not on the table for Robert, who was not hitting well even before the most recent injury.

“We have not gotten that indication,’’ Stearns said of surgery potentially being a possibility.

Polanco’s recovery from the left Achilles bursitis that’s plagued him much of the season has also been slow.

“We need to get asymptomatic on the ankle,’’ Stearns said. “We have really good days and then it flares up. We need it so he can play every day.”

Lindor is due to get a follow-up MRI on his strained left calf in the coming days and is out of a walking boot. The Mets won’t have a timeline for the shortstop’s potential return until they get the results of the MRI.

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A.J. Minter threw a bullpen session at Citi Field on Tuesday as the left-hander gets back from having his rehab from a season-ending lat injury last year stalled by left hip discomfort.

Minter said his hip feels fine, but he’s still dealing with mechanical issues that have impacted his command.

Stearns indicated Minter would need “at least one more” bullpen before he’s back in a minor league rehab game, and then he’ll have to pitch on back-to-back days before he’s a consideration to be activated.

Another two to three weeks remains the goal for the team.

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Stearns said left-hander Sean Manaea will remain in the bullpen.

“For now, the bullpen is the plan,’’ Stearns said of the veteran whose ineffectiveness knocked him out of the rotation. “We’ve had outings where there are glimmers of good pitching and outings that also haven’t been competitive. We’re working to get him back …”

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To make room for A.J. Ewing on the roster, Andy Ibáñez was designated for assignment after making a pair of errors at third base.