The Phillies and IronPigs swapped pitchers on Friday, with B.J. Rosenberg heading up to Philadelphia and Raul Valdes being optioned to the 'Pigs.
This is the third time this season that the Phillies have taken a starter out of the IronPigs' rotation.
Jonathan Pettibone was called up earlier this year to replace the injured John Lannan, and Tyler Cloyd was summoned to replace the injured Roy Halladay.
Despite pitching as a starter for the 'Pigs this season, Rosenberg is expected to pitch out of the bullpen for the Phillies.
Rosenberg is coming off his best outing of the season, when he threw seven shutout innings in the 'Pigs win over Durham on Sunday.