Boone was carted off the the field Thursday after he appeared to pull something in his left leg, Mike Klis of 9News Denver reports.
It remains to be seen if Boone needing a cart to get off the field was precautionary or indicative of an injury that could cost him regular-season time. Klis notes that the running back was having a strong training camp, and if healthy Boone is slated to work in a complementary role behind Melvin Gordon and Javonte Williams. If he misses any length of time, Royce Freeman would be a candidate for added opportunities in Denver's offense.