Mengden will be called up from Triple-A Nashville on Monday to start against the Indians, John Hickey of the East Bay Times reports.
The Athletics will have to replace their second rotation member in less than a week with Kendall Graveman (shoulder) set to join Jesse Hahn (triceps) on the disabled list Monday, allowing Mengden to get his first trial with the big club this season. Mengden has made only four starts with Nashville after foot surgery sidelined him for spring training and delayed his start to the campaign, but he's been spectacular in those outings, turning in a 2.21 ERA and 20:5 K:BB in 20.1 innings. Manager Bob Melvin has said that he expects Graveman to miss more than the minimum 10 days, so Mengden could end up seeing additional starts beyond Monday if he performs well.