Domingo German will miss the rest of the season — including the playoffs — because of domestic violence allegations, The Post confirmed Friday.

The right-hander was placed was placed on administrative leave Thursday because of an alleged physical incident involving the mother of his two children, Mara Vega, on Monday. He won’t pitch again until his case is resolved with Major League Baseball officials.

The swiftness of the action taken against German — with no fight put up by the MLBPA — demonstrated MLB had compelling evidence, even in the absence of a police report.

MLB initially learned of the incident from a third party, and has interviewed Vega, sources told The Post. The incident occurred the same day the couple and fellow Yankees honored the retiring CC Sabathia at a gathering at Hudson Yards.

German was at Yankee Stadium on Friday, as were MLB officials. And German was spotted by The Post outside his Yonkers home Friday, as well.

The Yankees clinched the AL East on Thursday night and are still aiming to finish with the best record in the majors for home-field advantage throughout the postseason.

Aaron Boone on Thursday said he heard “whispers” of an MLB probe prior to German taking the mound Wednesday evening.

German’s administrative leave starts at seven days, but can be extended for as long as the investigation warrants, the league said.

Boone has been the only Yankee or MLB official to speak publicly about German’s situation.

Asked Thursday about the prospect of heading into the playoffs without German, Boone said: “This is a bigger issue, obviously. When you hear the words ‘domestic violence,’ it’s one of the things that stops you in your tracks.”

German, 27, emerged as the Yankees’ most reliable starting pitcher this season, winning 18 games, second-most in the majors before Friday’s games. And he was in line to play a key role in the playoffs, perhaps in a tandem role with Sabathia. German had taken over in relief for Sabathia in the left-hander’s previous two outings and tossed a combined 6 ¹/₃ scoreless innings.

It was a strategy the Yankees were considering for the playoffs before learning of the alleged incident.

The Yankees opened their final home series of the regular season on Friday against Toronto and Boone said prior to the game in The Bronx there was no precise plan for how to make up for the loss of German.

“It’ll be a little bit of everyone,’’ the manager said. “We have more decisions to make as far as rounding [the pitching staff] out, whether we go with 11, 12, or 13 pitchers, however we do it and depending on who we’re gonna match up with in the first round. We’ll make those decisions accordingly and try to piece it together as best we can.”

The Yankees have overcome a constant drumbeat of injuries to key players and thrived despite those losses, winning their first AL East title since 2012.

Now they will look to continue that success in October to capture their first World Series title since 2009 without one of their most valuable pitchers- but for a vastly different reason.

Additional reporting by George A. King III and Ebony Bowden