The Reds returned Zulueta to Triple-A Louisville on Saturday.
Zulueta was sent back to Louisville one day after serving as the Reds' 27th man for a doubleheader with the Brewers. The right-handed reliever appeared in the Reds' 14-0 loss in the second game of the twin bill, punching out three batters in 1.1 innings but giving up four earned runs on four hits and one walk.