Masahiro Tanaka is officially an ex-Yankee.

The right-hander made the announcement himself on Twitter, writing he would spend the upcoming season back with his former team in Japan, the Rakuten Eagles.

It’s hardly a surprise, given how the offseason has gone for the Yankees and the 32-year-old Tanaka.

While the Yankees expressed interest in keeping Tanaka, their priority was re-signing DJ LeMahieu, and they brought the infielder back on a six-year, $90 million deal.

During a Zoom call after LeMahieu’s signing became official, LeMahieu said Tanaka will be missed.

“I just wanted to mention what a great teammate he’s been and what an impact he’s had on the Yankees and the city,” LeMahieu said. “Obviously, I wish him well and will be following him. As exciting as it is [to stay with the Yankees], I’m disappointed I’m not gonna be playing with him anymore.”

When the Yankees addressed the rotation, they opted to bring in a pair of talented right-handers coming off significant injuries — but for less money than Tanaka was seeking, as they try to stay under the $210 million luxury-tax threshold.

They signed Corey Kluber on a one-year, $11 million deal and traded four prospects to Pittsburgh in exchange for Jameson Taillon. The Yankees will count on them, as well as Jordan Montgomery and some combination of Domingo German, Deivi Garcia and Clarke Schmidt before Luis Severino is due back from Tommy John surgery in midseason.

Tanaka, who suffered a partially torn UCL during his first season after signing a seven-year, $155 million deal, was effective and durable throughout his tenure in The Bronx.

In a statement posted on Twitter in English, Tanaka thanked fans “for all the love and support you have given me for the past seven seasons. I feel extremely fortunate for having the opportunity to take the field as a member of the New York Yankees and play in front of all you passionate fans. It has been an honor and a privilege!”

He finished his Yankees career 78-46 with a 3.74 ERA and, until recently, was superb in the playoffs.

In his first seven postseason starts, Tanaka went 5-2 with a 1.32 ERA over 41 innings. But in his last three playoff appearances dating back to 2019, the right-hander was 0-2 with a 9.69 ERA, and his splitter lost some of its effectiveness.

He came to the Yankees as one of the most sought-after pitchers on the market, with the Yankees investing $175 million in Tanaka — including a $20 million posting fee to Rakuten.

Through his first 14 games with the Yankees, Tanaka more than lived up to the hype, going 11-1 with a 1.99 ERA and 113 strikeouts in 99 ²/₃ innings. But his season was upended by the elbow injury and he made just two starts after being shut down in July.

Still, Tanaka avoided Tommy John surgery and remained one of the Yankees’ steadiest pitchers and most respected figures in the clubhouse. He had an opt-out clause in his contract after his fourth year, which he quickly declined.

In September, Tanaka acknowledged his time with the Yankees could be coming to a close.

Asked about the possibility of his outing in Buffalo against the Blue Jays possibly being his final regular-season start with the Yankees, Tanaka said: “I just thought to myself it has been seven years and it has been a quick seven years. It is kind of an end to a chapter in a way, just that thought of being there for a good seven years. That is what came to my mind in Buffalo.”