Gray (forearm) is expected to test his injury during a throwing session Monday, Nick Groke of The Athletic reports.
Gray left Saturday's start against the Dodgers due to right forearm tightness, and manager Bud Black said Sunday that the 29-year-old is questionable for his next turn through the rotation, which would come Thursday at home versus Atlanta. The Rockies should have a better idea of the right-hander's status based on how he feels following Monday's throwing session.