Sanchez was 4-0 with four saves and a 2.85 ERA in 25 games at Indianapolis. Last season, he was 1-0 with a 5.00 ERA in 16 games with Pittsburgh.
With pitchers Ian Snell, Phil Dumatrait and Franquelis Osoria on the disabled list, the Pirates have called up or acquired six pitchers in a week's time. They called up Sanchez and reliever T.J. Beam, plus starters John Van Benschoten, Ty Taubenheim and Jimmy Barthmaier and traded for former Tigers reliever Denny Bautista.
Taubenheim and Barthmaier were sent back to Indianapolis after making spot starts during the weekend series against Tampa Bay, while Van Benschoten could be the Pirates' starter Wednesday in Cincinnati. Beam was recalled, sent back down and recalled again in a four-day span.
Bautista was struck in the right forearm by a line drive Friday in his first Pirates game but was not placed on the disabled list. With Bautista still on the 25-man roster, the Pirates are currently carrying eight relievers.
General manager Neal Huntington said Yoslan Herrera, a former Cuban pitcher signed by the Pirates before the 2007 season, also might start Wednesday. Herrera was recently promoted from Double-A Altoona to Indianapolis.