Surgery has yet to be completely ruled out, but the belief is that Morrow will be able to avoid the procedure and instead work his way back through an extensive rehab program.
Morrow had a 1-2 record with a 5.93 ERA in 27 1/3 innings before he went down with the injury. A return in late July would be crucial for the organization, because it would give the club a glance at what he can provide before the July 31 non-waiver Trade Deadline.
Gregor Chisholm is a reporter for MLB.com. Read his blog, North of the Border, and follow him on Twitter @gregorMLB. This story was not subject to the approval of Major League Baseball or its clubs.