SAN DIEGO — Jon Berti won’t be available to the Yankees anytime soon.

The infielder was diagnosed with a “high-grade” calf strain, manager Aaron Boone said Sunday morning, after getting injured running out of the box in the ninth inning Friday night at Petco Park.

Berti and the Yankees were still consulting with doctors in order to pin down a real timeline for how long he will be out after undergoing an MRI on Saturday.

“But it’s going to be a while,” Boone said.

Berti, who had crutches and a walking boot at his locker Sunday morning, was just starting to produce more consistently after returning from a groin strain earlier this season. He and Oswaldo Cabrera had combined to form a solid third base tandem while DJ LeMahieu was sidelined, and the Yankees expected him to serve as a valuable bench piece once they were whole.

Instead, he will be out for the foreseeable future, though the Yankees are set to get LeMahieu back on Tuesday when they start a series against the Angels in Anaheim.

The veteran played his sixth and likely final rehab game on Sunday with Triple-A Scranton/Wilkes-Barre, starting his first game at first base after playing the rest at third base.

Assuming he comes through Sunday’s game without issues, LeMahieu was expected to fly to California on Sunday night to join the team.