Manager Bruce Bochy said Tuesday that the Rangers will place Mahle on the injured list with shoulder stiffness, Shawn McFarland of The Dallas Morning News reports.
Mahle made his return from Tommy John surgery Aug. 6 and made three starts since, logging a 4.97 ERA in 12.2 innings. His most recent start ended after three innings and it appears he picked up an injury during the outing. The Rangers are expected to activate Jon Gray (groin) to fill Mahle's spot in the rotation.