Lopez will serve as the Athletics' opening pitcher for Friday's game against the White Sox, Martin Gallegos of MLB.com reports.
Lopez was recalled from Triple-A Las Vegas on Tuesday and pitched in relief later that night, surrendering four runs on five hits and one walk while striking out four over three innings in a loss to the Tigers. He'll pick up his 11th start of the season three days' later, but Lopez will most likely be capped around 1-to-3 innings before exiting the game. Friday had been Aaron Civale's turn in the rotation, so he's the most likely pitcher to work in bulk relief once Lopez exits the contest.