The Mariners acquired Garcia from the Blue Jays on Friday in exchange for outfielder Jonatan Clase and catcher Jacob Sharp, Jeff Passan of ESPN.com reports.
Garcia has been one of the better relievers in baseball this season, posting a 2.70 ERA and 42:8 K:BB K:BB over 30 innings while recording five saves. He will be part of the late-inning picture in Seattle but will likely be behind Andres Munoz in the pecking order for saves.