The Brewers optioned Megill to Triple-A Nashville on Thursday, Adam McCalvy of MLB.com reports.
Prior to Wednesday, Megill had gone six consecutive appearances without giving up a run. However, he was lit up for three runs over 1.1 innings during a loss to Arizona and will now return to the minors where he holds a 9.95 ERA through 12.2 innings this season. The Brewers have yet to announce a corresponding move, but a bullpen replacement should be added prior to Friday's game against Cleveland.