From there, he could progress to throwing off a mound, though there's no schedule for that just yet.
There had been some hope last week that Soria wouldn't need much more than the minimum 15-day stay on the disabled list, something team president/general manager Dave Dombrowski told MLB Network radio last Friday.
When Soria originally went on the DL Aug. 10, the hope was that he'd miss 2-3 weeks.
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. This story was not subject to the approval of Major League Baseball or its clubs.