Chatwood had since dealt with a setback and the 24-year-old already is on the 60-day DL. Tommy John surgery likely would keep him out for at least a significant portion of the 2015 season as well, due to the 12- to 18-month recovery time.
Chatwood, in his third season with the Rockies, posted a 4.50 ERA over four starts this year. In four MLB seasons, he's gone 20-22 with a 4.34 ERA in 70 games, including 61 starts.
Andrew Simon is a reporter for MLB.com. Follow him on Twitter @AndrewSimonMLB. This story was not subject to the approval of Major League Baseball or its clubs.