Stewart (shoulder) is scheduled to start a minor-league rehab assignment with High-A Rancho Cucamonga on Saturday, Ken Gurnick of MLB.com reports.
Stewart made a few appearances in extended spring training games earlier in the week, and apparently that went without a hitch, so he'll head to Rancho Cucamonga. Seeing as the 25-year-old has been sidelined since early spring training with shoulder tendinitis, Stewart will likely need at least a few appearances at High-A to build up his arm strength before he returns.