Sandy Alderson is taking an immediate leave of absence from his role as Mets general manager the team announced Tuesday ahead of their home game against the Pirates.

The Mets cited health concerns as the reason for the decision. Alderson then revealed his cancer had returned in April and he is undergoing chemo.

“You got to deal with it,” Alderson said, fighting back tears. “It’s a matter of rearranging priorities.”

He added: “In the best interest of the Mets and for my health this is the right result.”

Alderson, 70, was diagnosed with a treatable form of cancer in December of 2015, roughly a month after the Mets lost to the Royals in the World Series. He missed the Winter Meetings in early 2016 as he underwent chemotherapy and later had surgery related to the illness in May of 2016.

He will no longer have decision-making authority like he did during his previous leave of absence in 2016.

“I’m not sure coming back is warranted,” said a candid and somber Alderson.

When asked twice if he would allow Alderson to return to the GM role if his health improves, owner Jeff Wilpon responded both times by saying Alderson’s well-being and family are the “first and foremost” concerns.

“I feel badly that we’ve had the season we’ve had to date,” Alderson said. “I feel personally responsible for the results we’ve had. I have confidence in our manager, our coaching staff and our players that this will change.”

Assistant GM John Ricco will serve as interim GM.