Lopez was officially placed on the 10-day disabled list due to a strained back.
Lopez will miss at least one start after exiting Thursday's game in the fifth inning. According to MLB.com's Scott Merkin, manager Rick Renteria didn't seem too concerned about the right-hander's condition, but stressed that there's "literally no reason to take a chance." Moving forward, Mike Pelfrey could make a spot start in his place, while the club recalled reliever Danny Farquhar from Triple-A Charlotte to join the 25-man roster.