McGowan has been tabbed as the starting pitcher for Thursday's game against the Marlins, Stephen Gross of the Morning Call reports. Sean O'Sullivan had been lined up to make his third start of the season Thursday, but the Phillies placed him on the disabled list with a knee injury. McGowan will take over in his stead the first time around and could be a candidate to earn more starts for the time being until the starting rotation returns to full health.