McDermott was added to the Orioles' taxi squad Monday and is expected to start Tuesday's game in Milwaukee, Danielle Allentuck of TheBaltimoreBanner.com reports.
McDermott showed flashes in a spot start last week against the Twins, striking out five while yielding four runs over three innings. He missed the first month of the season with a lat injury and hasn't thrown more than 65 pitches in any outing, so McDermott is unlikely to go deep into Tuesday's start unless he's efficient.