PORT ST. LUCIE — Oliver Perez says he isn’t upset with his move to the Mets bullpen.

Terry Collins told Perez over the phone Wednesday that he was being shifted, and the lefty, who had been trying to win an unlikely spot in the Mets starting rotation, didn’t put up a fight.

“It’s OK,” Perez said Thursday. “I’m thankful he gave me the opportunity to be a starter. He said other guys pitched better than me and I agree.”

Collins said Perez will get his first shot at his new job Saturday, when the Mets travel to Orlando face the Braves.

“I’ll go to the bullpen and try to find a job there,” said Perez, who will get a chance to be a lefty specialist after his final subpar start Tuesday. “I feel confident and I know what I have to do in this situation to be a reliever. I have to throw strikes.”

That’s been an issue for Perez and doesn’t bode well for his future with the Mets, which is still expected to end before Opening Day.

“I feel more comfortable [against] lefties and this could be a really good job for me, for now,” said Perez, adding that he still wants to start at some point. “All my career I’ve been a starter.”

Perez said he believes he got a fair chance at making the rotation.

“[Collins] was clean with me,” Perez said. “When I came here, the first day of spring training, he said he wanted to give me an opportunity and if I [didn’t] do great, I’d move to the bullpen. I said ‘OK.'”

Perez added he didn’t try to convince Collins for another start.

“He’s the manager,” Perez said. “He’s the guy who has to make the decision. Sometimes you get mad, sometimes you understand. I understand. It’s about the team, it’s not about me. The best opportunity to help the team is to be in the bullpen.”