The Athletics placed Leiter on the 15-day injured list Tuesday, retroactive to Sunday, with a right hip impingement.
Leiter already spent time on the injured list in late June and early July due to a right hip impingement, and he'll now end up back on the shelf after aggravating the injury. Hayden Juenger was recalled from Triple-A Las Vegas in a corresponding move to replenish the Athletics' bullpen depth.