"I don't know how much starting I can do anymore," said McGowan, who had a 6.75 ERA in seven Cactus League appearances.
McGowan cited right-shoulder surgeries in 2008 and '10 and a shoulder injury in '13 as reasons why he is best suited for a full-time bullpen spot. He had a 3.35 ERA in 45 relief appearances last season.
Todd Zolecki is a reporter for MLB.com. Read his Phillies blog The Zo Zone. Follow him on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.