TAMPA, Fla. -- New York Yankees starting pitcher Luis Gil has been diagnosed with a high-grade lat strain in his right shoulder and will be out at least a couple of months.

Manager Aaron Boone did not disclose a specific timeline, but he said before Monday's spring training game against Pittsburgh that Gil won't throw for at least six weeks, after which he would need to fully build back up again.

Gil's injury likely means Marcus Stroman -- who entered camp seemingly as the odd man out in the rotation but also said he had no interest in going to the bullpen -- will open the season as the team's fifth starter. The Yankees also have veteran starting pitcher Carlos Carrasco in camp as a non-roster invitee, in addition to young starters Will Warren and Brent Headrick on their 40-man roster.

"You know these things are going to unfortunately come and pop up," Boone said. "They do at different times of the year. Hopefully, overall, you can stay fairly healthy, but unfortunately these things are inevitable, and that's why ... every team tries to build in some depth. We feel like we're in a good spot with who we have. It's part of it."

Gil, the reigning American League Rookie of the Year, experienced shoulder tightness during a bullpen session on Friday and underwent an MRI over the weekend that revealed the strain, though Boone said he still needs to undergo further examination. The hope is that Gil, 26, would return at some point in the first half, but that is unknown at the moment. Fellow starter Clarke Schmidt had a similar lat strain last year and missed about three and a half months, from late May to early September.

For optimism, the Yankees can look to last spring. Their ace, Gerrit Cole, missed the first two and a half months with nerve irritation and edema in his pitching elbow, but the rest of the rotation stepped up in his absence, posting a 3.47 ERA through the end of June and ultimately playing a big part in the Yankees winning the AL East. Now Cole, Stroman, Schmidt, Carlos Rodon and newcomer Max Fried must step up in similar fashion.

"It sucks, man; I don't even know what to say to put it into words," Stroman said after his Grapefruit League start against the Atlanta Braves on Sunday, which saw him allow four runs and record eight outs. "He was a huge part of this team last year. Incredible, incredible season, and we're going to need him. We're going to need him at some point in order to go where we want."

Gil spent most of the 2022 and 2023 seasons recovering from Tommy John surgery, then won a spot in the rotation the follow spring and put together a sensational 2024, going 15-7 with a 3.50 ERA in 151 innings. Gil walked 12.1% of the hitters he faced, by far the most among those with at least 150 innings, but he also compiled 171 strikeouts.

Most notable, though, was a significant workload bump for a pitcher who hadn't previously reached 110 innings in pro ball and wound up pitching for a team that reached the World Series. Boone said it was "tough to say" whether that innings jump triggered injury.

"It's pitching," Boone added. "Different things crop up. It's why we put so much value in what these guys do in their throwing programs and when they start, and we're methodical in how they go about it. I feel like we've started to turn a corner there, but it's certainly one of the things that is troubling in our game."