The often-injured McCarthy was signed after the 2014 season to a four-year, $48 million contract to replace fourth starter Dan Haren, who was traded to Miami.
McCarthy has been on the disabled list 10 other times with right shoulder blade problems dating back to 2007, including stress fractures and stress reactions as recently as 2013. He spent the entire 2010 season at Triple-A.
He also took an Erick Aybar line drive off the side of his head in 2012, resulting in life-threatening injuries and surgery. He recovered to sign a two-year contract with Arizona. In 2013, he had more shoulder problems and suffered a seizure related to his head injury, but rebounded in 2014 healthy enough to pitch 200 innings.