Atlanta optioned Herget to Triple-A Gwinnett on Monday, Justin Toscano of The Atlanta Journal-Constitution reports.
Herget, 30, recently returned from a shoulder injury and holds a 4.82 ERA and 10:3 K:BB over 9.1 innings in the majors this season. He's being replaced on the roster by Darius Vines, who was called up from Triple-A Gwinnett to provide the bullpen with some extra length.