Morrow shut down with nerve injury
Morrow began the season as Toronto's No. 2 starter and went 2-3 with a 5.63 ERA in 10 starts. He left a May 28 outing against Atlanta after just two innings and has not pitched since.
Multiple MRI exams showed only inflammation, but Morrow complained of persistent soreness. His injury, an entrapped radial nerve, was diagnosed following a visit Wednesday with renowned sports surgeon Dr. James Andrews.
Morrow won't resume throwing until September, leaving him little time to return to the Blue Jays in 2013.
A seven-year veteran and former first-round draft pick who came up as a reliever with Seattle, Morrow is 41-40 with a 4.22 ERA and 16 saves in 218 career games, including 102 starts.