On what was supposed to be a day of injury relief around the Yankees, yet another concern emerged for a club struggling both with health and performance.

The Yankees officially activated Trent Grisham and Ryan McMahon on Friday but placed Carlos Rodón on the 15-day injured list with what the lefty called “heavy inflammation” — but nothing worse — in his pitching elbow.

Rodón had been bothered by the elbow “on and off” for “the last couple weeks,” he said, and was having issues with recovery that escalated this week.

He underwent an MRI exam on Thursday that found the inflammation and, most notably, found a UCL that was still intact.

“I think it’s a pretty big exhale,” Rodón said before the Yankees opened a series against the Twins in The Bronx.

Carlos Rodon during his latest start against the Red Sox. AP Photo/Steven Senne

Rodón will receive a platelet-rich plasma injection and be shut down for a time — “at least a few days, maybe a week,” manager Aaron Boone said — before building up again.

Neither team nor player offered a timetable, but it is possible he returns within the month if the inflammation clears and recovery goes as planned.

At least at the moment, there is no long-term concern regarding Rodón’s elbow, which underwent a procedure in the offseason to remove loose bodies and shave down a bone spur.

Still, the Yankees will be without another capable starting pitcher — the 2025 All-Star has pitched to a 3.30 ERA in nine starts this season — at a time when they lugged a season-high, seven-game losing streak into play.

Even with an elbow that became increasingly tricky to handle, Rodón allowed two unearned runs on one hit in five innings on Sunday in Boston.

“I really feel like Carlos was throwing the ball well and doing some really good things,” Boone said. “Hopefully this is something that gets cleaned up and gets him in a better place so that he can return for the stretch drive and be even more of a factor for us.”

Also available for the stretch drive, the Yankees hope, will be Max Fried, who has been building up from a bone bruise in his elbow and is now facing hitters again.

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But as the Yankees stand today, the club’s rotation has hit its first adversity with Cam Schlittler coming off his worst major league start, Gerrit Cole proving human, Ryan Weathers’ ERA spiking from 3.14 to 4.08 in his past six starts and Will Warren letting up 13 runs in his past 16 ²/₃ innings.

They lack a true fifth starter and plan to summon Brendan Beck from Triple-A Scranton/Wilkes-Barre to either start or pitch several innings out of the bullpen on Saturday.

In his major league debut on May 7, the righty prospect allowed two runs in three innings during a win over the Rangers.

The higher-ranked Elmer Rodríguez was not an option after pitching Thursday, and Luis Gil (shoulder inflammation) has yet to begin a rehab assignment.

Hitting has loomed as the team’s biggest issue — the Yankees have badly missed Aaron Judge, who still does not know when he will receive further imaging much less when he can return, and the absence of Giancarlo Stanton has grown more significant.

The club hoped Grisham and even McMahon could provide a spark in the lineup and in the field.

But the rotation, which had been the Yankees’ greatest strength until just a couple weeks ago, added a bit more uncertainty Friday.

“I want to be back as soon as I can, whenever I’m ready,” Rodón said.