Iwakuma underwent arthroscopic surgery on his right shoulder Friday and will resume throwing in five months.

EDGE Analysis

That timetable would have Iwakuma beginning his rehabilitation right around the start of spring training. As such, it isn't guaranteed that the 36-year-old will be healthy and ready to go by the start of next season. Seattle has a $10 million option on the starter, but given Iwakuma's age and declining performance over the past two seasons, he may be on his way to free agency.