Milone signed a minor-league deal with the Mariners on Thursday, Ryan Divish of The Seattle Times reports.
Milone spent the majority of the 2021 season in the Blue Jays organization, which included 14 innings with the big-league club. He struggled while posting a 6.43 ERA and 1.64 WHIP. Milone will almost certainly start the season at Triple-A Tacoma, though he could reach the majors and appear in low-leverage roles as the season progresses.