Gray was slated for the rotation in Spring Training, but started the season on the 15-day disabled list with an abdominal strain. He started nine games for the Rockies in 2015, after his Aug. 4 debut at Coors Field, compiling on 0-2 record with a 5.53 ERA, including an 8.27 ERA at Coors Field. He had 40 strikeouts in 40 2/3 innings.
"We're hoping Johnny gives us a shot in the arm here," manager Walt Weiss said. "Bringing that prototypical power pitcher and plugging him into your rotation, potentially he's got a chance to give us a lift.