Luis Severino was among those surprised by his move to the 60-day injured list — and he’s not pleased about it.

A visibly irritated Severino said he was caught off guard Monday when the trainers told him he was going to be transferred from the 15-day IL. He has been rehabbing from a strained lat that has sidelined him since his most recent start, July 13.

“I was not happy,” Severino said Tuesday. “I was not expecting that.”

Luis Severino
Luis Severino pitches against the Astros

Severino thought he’d be back sooner, since he has only been out a couple of weeks and began a throwing program Monday.

He said he thought he’d play catch, throw some bullpen sessions and perhaps pitch a simulated game before rejoining the rotation sometime this month.

Instead, he’ll be out until mid-September.

Severino added he didn’t argue, saying, “If I fight it, what can I get?”

“I acknowledge without a doubt he was caught off guard,’’ general manager Brian Cashman said. “When we tried to walk through it with him with the calendar … he didn’t want to look at it. I think he’s a competitor. He just wants to pitch, but he’s not capable of pitching yet. It’s going to take time to get him back on line. We both wish he was healthy right now, both wish he was capable, but he’s not.’’

Cashman said that will enable Severino to go through a rehab process and still make about five starts down the stretch heading into the postseason. Severino is expected to be in the rotation for the playoffs, especially after the trade of Jordan Montgomery to St. Louis.

Manager Aaron Boone talked to Severino on Tuesday. Asked if he told Boone he was unhappy with the situation, Severino said, “I think he knows.”

Boone said Severino could be throwing from a mound within 10 days.

The Yankees needed to open up spots on the 40-man roster after adding three players on Monday, Frankie Montas and Lou Trivino from Oakland and Scott Effross from the Cubs. Moving Severino to the 60-day IL cleared a spot.

What didn’t play a role in the decision, though, according to Cashman, was the team’s monitoring of his innings after Severino missed much of the last three seasons due to arm injuries.

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“There’s no slow-play,’’ Cashman said of the program. “We want him back when he’s ready and capable. … This is the program that gets him back and you can’t speed it up where you risk breaking him again.”

As for how his arm and shoulder feel, Severino said “pretty good.”

He added he won’t know if he was 100 percent healthy until he faces hitters.