Rockies optioned LHP Sean Sullivan to Triple-A Albuquerque.

Sullivan retreats to the minors to make room for swingman Tanner Gordon to return from the injured list. The 23-year-old southpaw has struggled to an inflated 8.64 ERA, 1.86 WHIP and 12/9 K/BB ratio across 16 2/3 innings over four starts since being called up back on June 12.