Iwakuma will report directly to general manager Jerry Dipoto in his role, which he’ll begin at Spring Training.
“Kuma has demonstrated throughout his career skills that we think will make him a perfect fit working with our coaches and players,” Dipoto said Tuesday in a statement. “He was always prepared, has a terrific work ethic, and the ability to communicate the things that made him a successful pitcher. We’re looking forward to adding him to our mix at both the Major and minor league level.”
Iwakuma spent six years with the Mariners (2012-17) in his playing career, posting a 63-39 record with a 3.