CLEARWATER, Fla. — When spring training started, the Yankees had plenty of questions surrounding their starting rotation.

Would Corey Kluber and Jameson Taillon be healthy? Would Domingo German be sharp? Would Jordan Montgomery be able to improve on what he did last year?

Those questions, so far, have been answered just how the Yankees would have wanted, which allows them to open the season with a solid starting five that Aaron Boone announced Sunday morning.

After Gerrit Cole starts Opening Day on Thursday in The Bronx against the Blue Jays, Kluber follows in the second game of the season on Saturday, then German and Montgomery, with Cole coming back for the fifth game of the year, taking advantage of early off days in the schedule.

That means Taillon, coming off Tommy John rehab, won’t start until the sixth game of the season.

“With [Taillon], it gives us an opportunity to slow-play him a little bit,’’ Boone said. “He’s in such a good spot physically, but with the off days we have in April, we want to be mindful of building these guys up properly.”

Taillon said he’s “totally on board” with the delayed start to his season.

“We discussed — not a hard-innings limit on me — but an understanding early in the year, let’s get creative and see if we can save some bullets and ease into the year,” said Taillon, pointing to the fact he hasn’t pitched in a game that counted since May 1, 2019, prior to his second Tommy John surgery.

“We’ll conserve some bullets and build into competition mode,’’ Taillon said. “How the rotation starts isn’t how it ends.”

Kluber wasn’t sharp for a second straight outing in a 6-2 loss to the Phillies at BayCare Ballpark, allowing four walks and two runs in 3 ¹/₃ ⅓ innings, but he has been mostly pleased with his stuff.

“As far as my buildup, I’m right where we need to be,’’ Kluber said. “I don’t know if I’d say it was a relief, it was the expectation. … Things haven’t gone my way the last couple years, but I expected to feel the way I do now.”

German, who entered camp with quite a bit to prove — both on the mound and off it after being suspended for the shortened 2020 season because of a domestic-violence incident — has impressed.

“Domingo German is looking amazing,” Aaron Hicks said. “For a guy who missed that much time, to come back here and pretty much dominate is amazing to watch.”

“Every time he’s walked out there, he’s been excellent,’’ Boone said. “We’ve still got to build his pitch count a little bit, but feel he’s throwing the ball as well as anyone.”

And Boone also indicated, as he has previously, that the Yankees intend to use a sixth starter at least once in the first month of the season, which could open the door for the return of Deivi Garcia, who was optioned to Triple-A Scranton/Wilkes-Barre on Friday and will open the season at the alternate site.

Boone said the Yankees talked about the rotation for “several weeks” leading up to the final decisions and they want to “keep our guys as much as possible on the fifth or sixth day — and sometimes a seventh day — and it also avoids guys going on nine or 10 days [of rest].”

They ran into that issue at times last season following spring training 2.0, when J.A. Happ was sometimes skipped.

To keep everyone on schedule as much as possible heading into the regular season, German will pitch in Monday’s Grapefruit League finale in Tampa. Montgomery is scheduled to pitch a simulated game when the Yankees have their workout at Yankee Stadium on Wednesday as will Taillon on Friday ahead of his first start.