Garver will start at catcher and bat eighth in Sunday's game against the Guardians.
The veteran split time behind the dish with Jhonny Pereda from mid-May through mid-June while Cal Raleigh was on the injured list, but Garver has now returned to a reserve role. Though he'll crack the lineup Sunday while Raleigh serves as the Mariners' designated hitter, Garver is unlikely to see more than a start or two per week in his role as the No. 2 catcher.