Lyles is in the major-league bullpen for the Rockies' Opening Day bout with the Brewers, Thomas Harding of MLB.com reports.
Lyles didn't have the most impressive spring, but the multitude of injuries that struck Colorado's pitching staff over the spring were enough to place the right-hander in a long-relief role to begin the season. It bodes well for his roster standing that he's out of options, but if Lyles' performance is lacking, he could be removed from the 40-man so that prospect German Marquez and left-hander Chris Rusin (oblique) can both stick with the Rockies as long relievers once Rusin is healthy enough to return to action.