Gray was diagnosed with a right forearm bruise after leaving Saturday's start against the Astros, Kennedi Landry of MLB.com reports.
Gray was struck in the arm on a liner off the bat by Yainer Diaz, and the right-hander was unable to continue. He should be considered day-to-day for now, but it appears to be good news that there doesn't seem to be structural damage for Gray at this point.