Perez will start at catcher and bat seventh Wednesday against the Cubs.
Though he'll be behind the plate Wednesday, Perez was on the bench for Tuesday's 8-6 win after Jacob Stallings (concussion) was reinstated from the injured list prior to the contest. Stallings is expected to reclaim the No. 1 catcher job now that he's healthy again, so Perez is likely looking at no more than two starts over the Pirates' final four contests following Wednesday's game.