Right-hander Jhoulys Chacin, who hasn't pitched since May 1 because of a nerve injury in his chest, received high marks for a bullpen session he threw on Friday.
"My understanding is there was a lot more coming out today," Rockies manager Jim Tracy said. "He is definitely progressing. I was pleased to hear that."
Chacin was expected to be a staff leader and possibly push his way toward stardom, but he was 0-3 with a 7.30 ERA in five starts before the Rockies shut him down.
Right-hander Juan Nicasio (2-3, 5.28 ERA in 11 starts), out with a left knee strain, will face hitters on Saturday for the second time this week (three innings, 45 pitches), and at some point will be scheduled for fielding practice to test the knee.