Rodriguez is scheduled to undergo an MRI on his shoulder Sunday, Joe Stiglich of CSN California reports.
The reliever has already been diagnosed with a shoulder strain, and the MRI figures to reveal the extent of the damage. He left Sunday's relief appearance after recording just one out. Stiglich acknowledged the possibility of a DL stint for Rodriguez depending on the results of the MRI, so the A's could be making a roster move in the near future if Rodriguez winds up having to miss extended time.