St. John’s didn’t waste any time.

A day after rotation-players Greg Williams Jr. and Marcellus Earlington entered the transfer portal, Mike Anderson and his staff filled a need by landing a verbal commitment from Purdue combo forward Aaron Wheeler.

The lanky 6-foot-9 junior from Stamford, Conn., who has two years of eligibility left, can play on the wing and in the paint. He’s known for his athleticism and leaping ability as a reserve for the Big Ten stalwart. Wheeler averaged a career-best 18.3 minutes per game this year, along with 3.9 points and 4.4 rebounds.

“I kind of grew up a St. John’s fan, to be honest,” he told The Post after picking the Johnnies over Pittsburgh, Boston College, Florida Gulf Coast and a host of others. “I felt it was the best fit. I just like the way they go up and down. I like to get out in transition. They get after it on defense. I’m a versatile player, I can play multiple positions, guard multiple positions.”

Wheeler’s father William, who played for Bishop Loughlin in Brooklyn alongside Mark Jackson and is a member of the Manhattan College Hall of Fame, was very close to former St. John’s head coach and current Kansas assistant coach Norm Roberts. Father and son frequently attended games. Aaron’s favorite players were D’Angelo Harrison and D.J. Kennedy.

St. John’s assistant coach Van Macon has known the family for decades, and Anderson recruited Wheeler out of prep powerhouse Brewster Academy (N.H.), so there was already a relationship in place. Now, for the first time since early on in his high school career, Wheeler will get the chance to play in front of family and friends. But most of all, the opportunity to play a big role drew him to the program.

“I feel like I have more to contribute to winning,” he said. “I feel like I have more to bring to the table, and I want to showcase everything I’m capable of.”

A coach familiar with Wheeler described him as a definite high-major rotation player with untapped potential who fits better in St. John’s uptempo style than Purdue’s slow-paced, half-court system.

“His length and activity in St. John’s press will be good for them,” the coach said. “I think St. John’s will let him play a little more free on offense, which will loosen him up and allow him to just ball.

“It seemed like he was so worried about taking the wrong shot and getting subbed out at Purdue that it always limited his aggressiveness.”

Wheeler is the second transfer St. John’s has added, joining Vermont grad transfer guard Stef Smith. The Johnnies have lost seven players to the transfer portal since the season ended, with redshirt senior Rasheem Dunn joining the list on Thursday night.

That didn’t give him any second thoughts.

“Anywhere I’ve been, I’ve won. The same thing with coach Anderson,” Wheeler said. “I feel like we’re going to be good.”