Shawn Kelley had a setback after playing catch. His rehab is on hold. — Bryan Hoch (@BryanHoch) May 21, 2014
That's not good news. There was a slight chance that the Yankees could have gotten Shawn Kelley back this weekend, but that's not happening now.
Joe informed the media before this afternoon's game that Kelley suffered a setback with his rehab work and is being shut down for the time being. He played catch on Monday and woke up yesterday with more back stiffness, so clearly he's not even close to ready to return to action. According to Dan Barbarisi, tests on Kelley's back are still coming back negative, which is good news, but the team is "taking it slow" for now. No timetable for his return, more on this as it comes out.