The Reds recalled Zulueta from Triple-A Louisville on Tuesday.
It's the first major-league promotion for Zulueta, who holds a 2.84 ERA with 40 strikeouts over 31.2 innings this season at Louisville. The 26-year-old also posted a 14.5 percent walk rate at Louisville, so he'll have to show he can consistently find the strike zone before the Reds trust him in high-leverage situations.