Rodriguez (shoulder) will undergo an MRI on Tuesday, Susan Slusser of the San Francisco Chronicle reports.
Rodriguez threw just one pitch in Sunday's game against the Pirates before feeling pain in his shoulder, resulting in the A's quickly pulling him from the contest. The team wasted no time in transferring him to the disabled list earlier in the day Monday, but the MRI should determine the full extent of his injury. For now, Rodriguez has been diagnosed with a right shoulder strain.