The Mariners optioned Loutos to Triple-A Tacoma on Sunday.
Scooped up off waivers from the Nationals earlier in the offseason, Loutos will begin his time in the Mariners organization at the Triple-A level after he was unable to secure a spot in the Opening Day bullpen. The right-hander took himself out of consideration after yielding seven runs (six earned) on seven hits over three innings in four appearances during Cactus League play.