Mets starter Carlos Carrasco was placed on the 15-day IL due to a low-grade strain in his left oblique. The Mets estimate his recovery timetable to be about three to four weeks.

“Carlos got the test back, it’s actually pretty good news,” Buck Showalter offered optimistically. “Grade 1 (strain), that’s good news. We thought it could have been something a little deeper. We hope it’s not as long as some of those things take, we’ll see.”

Carrasco left Monday’s game after two innings, which were interrupted by a rain delay. On his way into the tunnel after the second, he could be seen grabbing at his oblique.

“I actually look at it as, maybe, an opportunity to freshen him up arm-wise,” Showalter said. “I think he’s exceeded the things that we thought he might do.”

Stephen Nogosek was brought up from Syracuse to replace Carrasco. Nogosek has pitched in nine games for the Mets this season with a 2.30 ERA. Additionally, the Mets made a right-handed reliever swap. Adonis Medina was optioned to Triple-A while R.J. Alvarez was called up. Alvarez last pitched in the big leagues in 2015 with Oakland. He posted a 3.38 ERA and 22.3% strikeout rate in 29 games for Syracuse this year, all of which were out of the bullpen.

In the final roster move of the day, outfielder Nick Plummer was designated for assignment.

PLANNING THE ROTATION

Showalter was questioned about David Peterson, who is not technically on the active roster after being optioned to Triple-A on Aug. 6, but is with the team in Atlanta. He seems like the obvious candidate to get called up and take Carrasco’s turns in the rotation, but Showalter said that’s not set in stone.

“I’m not going to commit totally to that. I know we’re going to take Trevor Williams out [of consideration to pitch]. He could probably play short [on Tuesday] if we had to. But we’d really like to get him a good, lengthy work day to set him up to throw more innings. He’s probably going to make one of those starts in the doubleheader [on Saturday in Philadelphia]. We’ll try to manage through that.”

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