Choking back tears at a surprise news conference, Sandy Alderson revealed what he had just told his team moments before.

His cancer has returned, he’s taking a leave of absence — and his up-and-down tenure as New York Mets general manager is essentially over.

With the team in a massive tailspin, chief operating officer Jeff Wilpon and Alderson made the announcement before Tuesday night’s home game against Pittsburgh.

“With respect to the future, I would say two things: One is, notwithstanding the good prognosis, my health is an uncertainty going forward,” said Alderson, 70, who agreed to a contract extension in December. “And secondly, if I were to look at it on the merits, I’m not sure coming back is warranted.”

Asked whether he would like Alderson to resume his GM duties if his health eventually allowed that, Wilpon avoided expressing an opinion and answered the same way twice: “I think his health and his family are first and foremost.”

Assistant general manager John Ricco and special assistants J.P. Ricciardi and Omar Minaya will run the team’s baseball operations in Alderson’s absence. Minaya preceded Alderson as Mets general manager, and Ricciardi was GM of the Toronto Blue Jays from 2001-09.

Alderson was hired by the Mets after the 2010 season. He was diagnosed with cancer at the end of the 2015 season and had surgery but stayed on the job.

He reduced his work schedule at times but remained in a full-time role while undergoing chemotherapy treatments.

“I will not have the decision-making authority going forward,” Alderson said. “If people want to call me, they’re welcome to do so. But at the same time, I don’t expect to be involved in day-to-day activity.”

Kris Bryant goes on DL

The Chicago Cubs placed Kris Bryant on the 10-day disabled list with left shoulder inflammation, marking the first time the fourth-year player has gone on the DL.

The 2016 NL MVP is batting .280 this season with nine home runs, 36 RBI and an .864 OPS.

Cubs manager Joe Maddon said the injury was not considered serious and he expected Bryant to be activated next Tuesday.

Maddon said the team wants to “make sure that he is well” and “cool down and just have him be well afterward.”

In other moves, the Cubs put reliever Justin Hancock (shoulder) on the 10-day DL, optioned Duane Underwood Jr. to Triple-A Iowa and callecd up infielder David Bote and pitchers Luke Farrell and Dillon Maples from Iowa.

Around the bases

New York Yankees right-hander Masahiro Tanaka (hamstrings), on the disabled list since June 9, threw a bullpen session. ... The Baltimore Orioles put right-hander Dylan Bundy (ankle) on the 10-day DL and recalled reliever Donnie Hart from Triple-A Norfolk. ... The Texas Rangers put first baseman Ronald Guzman (concussion) on the seven-day DL and recalled utilityman Ryan Rua from Triple-A Round Rock. ... The Milwaukee Brewers put outfielder Lorenzo Cain (groin) on the 10-day DL and recalled outfielder Keon Broxton from Colorado Springs.