The Brewers optioned Sproat to Triple-A Nashville on Tuesday.
Sproat made the Brewers' Opening Day rotation and has shown flashes this season, but the consistency hasn't been there, with the righty turning in a 5.27 ERA, 1.42 WHIP and 100:48 K:BB over 95.2 innings. His spot in the Milwaukee rotation will be absorbed by Dustin May, who was acquired at Monday's trade deadline.