The Rockies reinstated Anderson (oblique) from the disabled list Monday and promptly optioned the southpaw to Double-A Hartford.
Anderson will retain his 40-man roster spot, but after missing the entire 2015 season due to an elbow injury, the 26-year-old will continue his march to the majors at the Double-A level. In one rehab outing prior to his activation, he yielded two runs on two hits and five walks to go with six strikeouts in 3.2 innings at High-A Modesto.