Chatwood was removed from Friday's game against the Mariners in the top of the third inning after legging out a triple. The club characterized his injury as a slight strain and cramping. Jordan Lyles, who was optioned to Triple-A on Friday, appears in line to take Chatwood's place if he is unable to make his next start.
"The ball was hit in the gap and I was running like I always do, playing hard," Chatwood said. "I hit a little soft patch of dirt coming around second and I stretched a little too far. It's just how I was raised to play so I'm not going to dwell on anything."
Chatwood struck out one batter and walked one in two scoreless innings before the injury. He went 8-5 with a 3.15 ERA in 20 starts for the Rockies last season.
"We think it's minor right now so we'll just work on it and go day by day," Chatwood said.
Jesse Sanchez is a national reporter for MLB.com. Follow him on Twitter @JesseSanchezMLB. This story was not subject to the approval of Major League Baseball or its clubs.