McMahon is out of the lineup for the first game of Saturday's doubleheader against the Giants.
With southpaw Blake Snell on the mound for the Giants in Game 1, the lefty-hitting McMahon will head to the bench. Aaron Schunk will bat ninth and play third base during the matinee, though McMahon should be back in the lineup for the nightcap against right-hander Hayden Birdsong.