All Blacks star Richie Mo'unga is heading to Japanese club rugby after the 2023 Rugby World Cup, signing with Toshiba Brave Lupus.

The All Blacks playmaker is to join the Japanese club from Super Rugby's Crusaders after next year's Rugby World Cup.

Toshiba announced the move, saying Mo'unga would be joined by Highlanders and All Blacks flanker Shannon Frizell at the club, which is coached by ex-New Zealand captain Todd Blackadder.

Reports in the New Zealand media said 28-year-old Mo'unga, who has 44 All Blacks caps, signed a three-year deal with Toshiba.

Under New Zealand Rugby rules, Mo'unga and Frizell will not be eligible to play for the All Blacks while in Japan. The two are set to join the club after the 2023 World Cup in France.

Frizell, 28, has made 25 appearances for the All Blacks since making his debut in 2018.

Mo'unga, who played 94 games for the Crusaders and scored more than 1,000 points, said he was looking forward to experiencing rugby with an overseas team.

"I'm grateful for this opportunity and to be part of the Lupus family, and I plan on doing everything I can to make Toshiba Brave Lupus Tokyo the No. 1 team in Japan," he said in the media release. "It's a dream of mine to play rugby overseas and to experience a different culture, and I know this will be an amazing experience for my family."