Logan worked one shutout inning for Triple-A Colorado Springs at New Orleans on Thursday, and he was scheduled to work again Friday. He is eligible to come off the DL on Saturday, but indications are the Rockies will wait a day in light of Logan working back-to-back days.
Logan's spring was slowed by his recovery from offseason surgery to remove bone chips from his left elbow. He was signed to a three-year, $16.5 million free-agent contract in the offseason to add left-handed depth to Colorado's bullpen.
Injuries led the Rockies to open the season with Rex Brothers as their only left-handed reliever. Franklin Morales is currently in the rotation, while lefty starters Jhoulys Chacin and Tyler Chatwood are both on the DL.
"When you only have one lefty [in the bullpen], you have to be careful where you use him," manager Walt Weiss said. "We had no lefty available [Thursday in Miami]."
Rox relievers were tested in the four-game season-opening series against the Marlins. Rockies starters combined to work only 20 2/3 innings, and Brett Anderson, who started Game 2 on Tuesday, was the only starting pitcher to work six innings.
Tracy Ringolsby is a columnist for MLB.com. Thomas Harding is a reporter for MLB.com. Follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.