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MacPhail, 63, served as general manager of the Twins when they won the 1987 and '91 World Series. He also served as Cubs president, and most recently as Orioles president of baseball operations.
Gillick's future with the Phillies could have a domino effect on the club's front office and coaching staff at the big league level. General manager Ruben Amaro Jr.'s contract expires at the end of the season, and Gillick already has said Amaro's future will not be decided until then. A new president could completely reshape the leadership structure on the baseball side of the organization.
Todd Zolecki is a reporter for MLB.com. Read his Phillies blog The Zo Zone, follow him on Twitter and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.