The Mariners placed Brash on the 15-day injured list Wednesday due to a right lat strain.
Seattle recalled right-hander Domingo Gonzalez from Triple-A Tacoma to take Brash's spot in the bullpen. Brash has served as one of the top setup arms in front of closer Andres Munoz this season, notching three wins and six holds while accruing a 0.54 ERA, 0.84 WHIP and 15:6 K:BB across 16.2 innings over his 20 appearances.