Estevez was reassigned to minor league camp Friday, Patrick Saunders of the Denver Post reports.
Estevez had a rough spring with the major league club, so he'll head back to the minors to get more work against competition at his level. It's unclear whether he'll head to Double-A Hartford or Triple-A Albuquerque, but either way, he'll look to continue his high-strikeout/low-walk ways like he's done in the past.