"His next step is hopefully running full-speed," manager Buck Showalter said. "The last thing he's had yet to do is sprint. And to be able to do it the next day and the next day, so to speak. I don't know when that's going to be."
Third baseman Michael Almanzar (knee) will start light baseball activities on Monday, with right-hander Luis Ayala resuming throwing in Triple-A that day as well.
Right-handed pitcher Dylan Bundy, the O's top prospect, is slated to throw a 30-pitch bullpen session on Monday off a regular mound, with Johan Santana scheduled for a situational side.
Outfielder Francisco Peguero, who has been strengthening his wrist since he had the cast removed last week, will resume baseball activities and start a hitting progression on Monday.
Brittany Ghiroli is a reporter for MLB.com. Read her blog, Britt's Bird Watch, and follow her on Facebook and Twitter @britt_ghiroli. This story was not subject to the approval of Major League Baseball or its clubs.