The Orioles placed Kremer on the 15-day injured list Thursday, retroactive to April 20, due to a right quadriceps strain, Roch Kubatko of MASNSports.com reports.
In a corresponding move, the Orioles recalled Brandon Young from Triple-A Norfolk, who will step into Kremer's open rotation spot. Kremer will miss at least a couple turns through the rotation but could be out longer given that the severity of the strain has yet to be disclosed.