Milwaukee optioned Anderson to Triple-A Nashville on Wednesday.
Anderson will give up his spot on the active roster to lefty Kyle Harrison (forearm), who was reinstated from the 15-day injured list ahead of his scheduled start Wednesday versus the Pirates. The 29-year-old righty has been serviceable out of the bullpen this season with a 3.70 ERA, 1.11 WHIP and 41:18 K:BB through 48.2 innings, so he shouldn't have to wait long before getting another call-up to Milwaukee.