Kelley said that he first started to be bothered by the stiffness during the team's series this week against the Angels in Anaheim. A precautionary MRI taken on Friday in Milwaukee revealed no structural damage, and Kelley said that he does not believe a trip to the disabled list will be necessary.
"We'll just take it day by day," Kelley said.
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.