Peralta will serve as the Padres' opening pitcher in Monday's game versus the Cardinals.
Peralta is expected to work the first inning or two before giving way to Lucas Giolito, who will operate as a bulk reliever Monday after starting in his first five appearances for the Padres. Peralta has managed to go unscored upon in 14 of his last 15 appearances, but he has an ugly 12:13 K:BB over 19.2 innings during that stretch.