The MRI on Alvarez's shoulder was inconclusive, Susan Slusser of the San Francisco Chronicle reports.
Alvarez played catch Wednesday after undergoing the test, and the throwing session reportedly "went OK." Manager Bob Melvin said the fact that nothing jumped out on the MRI "does give you some optimism," but the team will send Alvarez to see Dr. James Andrews to get a better understanding of what's going on. Alvarez appeared on the verge of a return to the majors before suffering the setback during a rehab appearance.