Peralta is out of the lineup for Wednesday's game against the Athletics.
Manny Machado remains limited to designated hitter duties after missing out on four straight starts last week due to a hip flexor strain, so the Padres won't have room in the lineup for Peralta for the third contest in a row. Once Machado is cleared to play regularly at third base again, Peralta will likely form a platoon at designated hitter with Donovan Solano.