Rookie right-hander Scott Oberg was optioned to Triple-A Albuquerque to clear a roster spot.
De La Rosa missed his first two turns in the rotation after straining his left groin during spring training. He was 14-11 with a 4.10 ERA in 32 starts last year and signed a $25 million, two-year contract. De la Rosa was 20-3 at Coors Field the past two seasons.
Oberg was 1-0 with a 10.13 ERA in three games with the Rockies this season.