Peterson in fifth spot ‘right now’

David Peterson can circle Sunday on his calendar.

The rookie left-hander will remain in the Mets rotation, manager Luis Rojas confirmed Wednesday, a day after Peterson earned the victory in his MLB debut with a solid outing against the Red Sox.

“We talked about [Marcus] Stroman as week-to-week, but Peterson is our fifth starter right now,” Rojas said before the Mets lost to the Red Sox, 6-5, at Citi Field.

Stroman, who is on the injured list with a torn left calf, has been throwing “full tilt” bullpen sessions, according to Rojas, but there is still the question of when he will be healthy enough to show he can field his position.

Peterson allowed two earned runs on seven hits and two walks over 5 2/3 innings against the Red Sox. His next start would also come on the road, in Atlanta.

Pitching coach Jeremy

Hefner was asked what he took from Peterson’s performance.

“I didn’t have much to do with Petey — that was a big win for the organization, for our player development system,” Hefner said. “Petey was unfazed and stayed on the aggressive the entire night. I was glad I was able to witness that.”

➤ The Mets placed Jake Marisnick on the injured list with a strained left hamstring. Ryan Cordell was selected from the Mets’ alternate training site and added to the 30-man roster. Jordan Humphreys was designated for assignment to clear space on the 40-man roster.

➤ Robert Gsellman (strained triceps) is expected to begin facing hitters during live batting practice in the next day or two, according to Rojas. Two other sidelined relievers, Brad Brach and Jared Hughes, have been throwing. Hughes has faced hitters and Brach is throwing bullpen sessions.