The Knicks’ home opener will take place Saturday, Oct. 26 vs. the revamped Celtics at the Garden, The Post has learned.

The immediate Celtics visit means ex-Knick center Enes Kanter will make an early Garden return. It also will give new Knicks forward Marcus Morris, who played for the Celtics, a chance to go against his former club.

The Knicks will open the 2019-20 regular season on the road. The first regular-season visit to the Garden by No. 1 overall pick Zion Williamson is Jan. 10 when New Orleans comes to town, according to an NBA source.

The NBA will announce its schedule at 3 p.m. on Monday.

A source confirmed the Knicks will see Kristaps Porzingis for the first time in a Dallas uniform on Nov. 14. Porzingis has not played a game at the Garden since Feb. 6, 2018, so it will be his first showing in 21 months, if he is healthy.

The Knicks, who will not be on the marquee Christmas schedule, open training camp Sept. 30 in Tarrytown.

Their preseason tips off in Washington on Oct. 7. The highlight of the preseason schedule is Williamson’s first game at MSG as a pro when the Pelicans visit Oct. 18.

Coming off a league-worst 17-65 season, the Knicks signed seven free agents, but didn’t net a superstar as they had hoped. New Knicks signee Bobby Portis told The Post the Las Vegas over-under figures for the Knicks – anywhere from 27-to-29 wins – is off.

“It’s pretty low,” Portis said. “We’re trying to make the playoffs. Twenty-eight wins isn’t going to do it. Everyone has their opinion. But if we stick together, [the] sky is the limit. We have weapons to make noise in the East.”