The Rockies recalled Shook from Triple-A Albuquerque prior to Sunday's game against the Giants.
Colorado optioned left-hander Sean Sullivan to Triple-A to open up a spot on the active roster and in the bullpen for Shook. The 28-year-old right-hander was previously up with the Rockies for a week in early June, making three appearances while allowing two earned runs on four hits and no walks across 3.2 innings.