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PORT ST. LUCIE — The Yankees are adding an AL East veteran to their bullpen.

The club signed lefty Ryan Yarbrough to a major league deal on Monday, filling one of the three open spots they had in their bullpen on the Opening Day roster.

The one-year deal is worth $2 million, with a chance to make $250,000 in performance bonuses, The Post’s Joel Sherman reported.

The soft-tossing, side-arming Yarbrough, 33, had been in camp with the Blue Jays this spring but opted out of his minor league deal.

The longtime Rays swingman split last year between the Dodgers and Blue Jays, posting a 3.19 ERA across 98 ²/₃ innings and 44 games.

“Track record, a guy that can give you real length,” manager Aaron Boone said Monday at Clover Park. “Definitely a different look. A guy that’s had a lot of success against us over his career. But just gives us some more depth, a real length option and a track record.”

The addition of Yarbrough gives the Yankees a second lefty in the bullpen alongside Tim Hill.

They thought they were going to have a second lefty in non-roster invitee Tyler Matzek, but the veteran has been delayed by an oblique strain, though he could return by mid-April.

Yarbrough arrived at the Yankees facility in Tampa on Monday and will join them on Tuesday in Miami, where he will throw an inning in the exhibition against the Marlins.

With Yarbrough in the fold, that will likely push lefty Brent Headrick or righty Yerry De Los Santos to Triple-A to start the season.

Yoendrys Gómez is also competing for one of the last spots, but he is out of minor league options, making it likely he is on the roster.

The Yankees cleared a spot on the 40-man roster for Yarbrough by putting Luis Gil on the 60-day injured list.

It already looked like Pablo Reyes was going to make the team before Monday, but he added to his case by going 3-for-3 with an opposite-field home run while playing right field and third base in a 6-6 tie with the Mets.

“Love it, love how he’s looked all spring,” Boone said. “He had a couple games there where he didn’t swing it great, but around that, it’s been a lot of really good at-bats. There’s life in the bat too. He’s moved around and showed his defensive versatility too. He’s done a great job.”

Marcus Stroman, who will start the third game of the season, made his final spring tuneup, building up to 70 pitches across 3 ²/₃ innings.

“Good to get to 70, four ups,” Stroman said. “I feel like I’m good for five and 85 going into the season. Good to make it out of here feeling good, healthy and ready for the season.”

Carlos Carrasco threw live batting practice back in Tampa on Monday.

He is expected to be available out of the bullpen this weekend against the Brewer before slotting into the rotation anywhere from the fifth to seventh game of the season.