Feltner was optioned to Triple-A Albuquerque on Sunday.
Feltner's record dropped to 1-2 following Sunday's start against Atlanta, as he allowed six runs on seven hits and a walk while striking out three in three innings. However, the right-hander posted a 2.25 ERA and 0.83 WHIP over 12 innings in his two starts prior to Sunday's outing, so he should still be in the mix to start next week when the Rockies need a sixth starter during Saturday's doubleheader in San Diego.