MTA subway boss Andy Byford on Tuesday addressed reports that he briefly resigned from his post this month amid tensions with Gov. Andrew Cuomo — saying he had unspecified “concerns” but insisting he is now “here to stay.”

“I had some concerns that I expressed to my principals at the MTA — not the governor — at the MTA,” Byford told reporters at an unrelated press conference in the Bronx.

“As far as I’m concerned, those concerns have been addressed.”

Byford repeatedly declined to say exactly what his concerns were.

“I gained reassurance that the concerns I was expressing had been addressed,” he said.

Last week, Politico New York first reported that Byford submitted a letter of resignation to MTA Managing Director Ronnie Hakim, but had second thoughts.

The MTA, which initially refused to confirm the resignation, later said the letter had been rescinded.

“As far as I’m concerned, last week is ancient history,” Byford said, insisting, “I’m here to stay and I mean that.”

Byford commented on his relationship with Cuomo, saying, “We’re on the same page.”

“Rightly he pushes us along. He holds our feet to the fire. He wants us to improve things,” the New York City Transit chief said.

“Every job has its frustrations. At the end of the day, that’s why they pay you the big bucks, I suppose,” added Byford, who made $325,600 last year, according to watchdog SeeThroughNY.

He also expressed his passion for the gig.

“At the end of the day, I love this job and I love this city, actually, very much,” said Byford, who noted that he’s here to stay “for the long term.”

When asked to define “long term,” Byford said: “To get the job done. I’ve always said that this is a multi-year job.”