Sulser was placed on the 15-day injured list Wednesday with a right lat strain, Christina De Nicola of MLB.com reports.
In a corresponding move, the Marlins called up Daniel Castano from Triple-A Jacksonville in advance of his scheduled start in Wednesday's series finale in Philadelphia. Sulser, who has two saves to his name this season, had settled into more of a setup role in June with Tanner Scott notching each of Miami's last four saves. Scott should gain further job security with Sulser out of commission for the time being.