The Brewers outrighted Weigel to Triple-A Nashville on Monday.
Weigel went unclaimed off waivers when he was dropped from the Brewers' 40-man roster Friday in the wake of the trade deadline. Acquired in April in the deal that sent Orlando Arcia to Atlanta, Weigel has made three appearances out of the Milwaukee bullpen this season, giving up two earned runs on four hits and four walks while striking out nine in four frames.