Gray left Friday's outing due to left foot soreness, MLB.com's Thomas Harding reports.
The Rockies' top pitcher had an early departure from his outing Friday, and because he didn't appear to be favoring anything as he left the mound with the Rockies' training staff. It has since been diagnosed that his left foot, the front foot in his delivery, was ailing him. The extent of his injury has yet to be revealed, so it should just be considered soreness at this time.