Anderson was recalled from Triple-A Albuquerque on Saturday, Nick Groke of the Denver Post reports.
Anderson got the promotion when Rockies closer Jake McGee landed on the DL with a knee strain. The 26-year-old left-hander has performed well in the minors this season, compiling a 2.35 ERA and 1.17 WHIP over 30.2 innings between stints at High-A Modesto, Double-A Hartford, and Albuquerque. The southpaw will figure to add bullpen depth for Colorado during his first stay in the majors.