Reynaldo Lopez will be called up to make his White Sox debut on Friday against the Royals.
Mike Pelfrey has been bumped to the bullpen to open a rotation spot for the 23-year-old top pitching prospect. Lopez, acquired from the Nationals in the offseason Adam Eaton trade, has registered a 2.70 ERA and 63/15 K/BB ratio over his last 46 2/3 innings at Triple-A Charlotte. White Sox general manager Rick Hahn said he'll be up for good.