The Brewers optioned Peguero to Triple-A Nashville on Monday, Curt Hogg of the Milwaukee Journal Sentinel reports.
Peguero had posted a 1.38 ERA and 13:6 K:BB over his last 13 innings covering 15 appearances but nonetheless finds himself back in the minors. The Brewers have not yet announced a corresponding move, but Trevor Megill (back) returning from the injured list appears highly probable.