"He's had kind of a cranky arm," D-backs manager Kirk Gibson said. "The bullpen and the way we've been using it, we tried to trim him out as much as we could, but after he had more discomfort yesterday, we got to the point where we need to kind of examine it a little more closely."
Reynolds was scheduled to have an MRI taken Monday and then see team physician Michael Lee on Tuesday.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.