Gray (elbow) is expected to begin a rehab assignment with Triple-A Albuquerque on Sunday, Nick Groke of The Athletic reports.
Gray is slated to serve as the starter for Triple-A Albuquerque on Sunday, and he could rejoin the Rockies' rotation next weekend in Milwaukee if all goes well. The right-hander threw a bullpen session Thursday and has recently been working on the timing of his delivery.