Cardinals manager Oliver Marmol said Friday that O'Brien will be shut down for a few days due to a mild right calf strain, Brian Murphy of MLB.com reports.
Nootbaar (heels) has been able to hit and throw without issue but is just now getting into the stage of being able to run unaided, Jeff Jones of the Belleville News-Democrat reports.
Dobbins (knee) will travel Wednesday to visit a doctor in Wisconsin, where he hopes to be fully cleared for spring-training activities, Derrick Goold of the St. Louis Post-Dispatch reports.