The Athletics have decided to shut Alvarez (shoulder) down after he experienced renewed soreness following Saturday's rehab outing at Triple-A Nashville, Connor Letourneau of the San Francisco Chronicle reports.
The 26-year-old has been on the DL all season since undergoing arthroscopic surgery on the shoulder in July 2015, but was believed to be on the cusp of returning after he made his fifth rehab start at Triple-A on Saturday. Those plans have now been tabled after this setback, and Alvarez will be forced to meet with Dr. James Andrews in the coming days for an evaluation.