"[I was] just doing [infield drills] and felt something a little bit there," Detwiler said. "So we kind of talked about it, and it's too early in the season to push through it and I don't want to deal with this for the next four or five months."
Detwiler is planning to go with the team to Atlanta and monitor his injury there.
"I've never gone through anything like this before, so that's a question for the trainer," Detwiler said.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. Andrew Simon is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.