Mountcastle (foot) is not starting a rehab assignment Tuesday night as initially planned and he is now being reevaluated, Matt Weyrich of The Baltimore Sun reports.
The 29-year-old was supposed to start a rehab assignment with Triple-A Norfolk Tuesday after having progressed through his recovery from a left foot fracture at a steady rate. Manager Craig Albernaz said, "Mountcastle wasn't feeling 100%" and that "to start a rehab assignment not 100% is not where you want to be," Jake Rill of MLB.com reports. The Orioles will know more on Mountcastle Wednesday.