Hisashi Iwakuma has joined the Mariners as a special assignment coach.

The Yomiuri Giants announced Monday that Hisashi Iwakuma will retire at the end of the season.

Iwakuma has signed a contract with the Yomiuri Giants for the 2019 season, the Kyodo News reports.

Iwakuma (shoulder) will attempt to play in Japan in 2019, Greg Johns of MLB.com reports.