Lopez allowed one hit and struck out four over three scoreless relief innings in Sunday's 2-1 win over Cleveland.
It was a modified bullpen day for the White Sox, who called up Jimmy Lambert to start and got by with a string of relievers after that. Lopez has been an innings eater for the pale hose since his call up from Triple-A, pitching more than an inning in five of seven appearances. He has a 1.29 ERA over 14 innings and should be a prime candidate for a spot start or as a piggy-back starter when manager Tony La Russa wants to give the established rotation members a break.