The Brewers recalled Gasser from Triple-A Nashville on Saturday.
Gasser was sent down after making his last start during Tuesday's doubleheader, and he'll now return to the active roster Saturday to replace the injured Kyle Harrison (forearm). Gasser could be available to work in long relief during the Brewers' final three games before the All-Star break, before moving to the rotation to start in place of Harrison to begin the second half.