"The catch is on hold, the side will be on hold for a little, and obviously the rehab game that we were planning is on hold," Girardi said. "We just have to wait and see."
The Yankees were hoping to have Kelley pitch in a Minor League rehab game this weekend, but those plans have been scrapped. Girardi said that Kelley was sent for more tests, but they came back clean.
"He's just having some muscular issues back there, it seems to be," Girardi said. "There's no disc problems; at least from the MRI we haven't had any."
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.