Lopez allowed a hit and two walks with four strikeouts over three scoreless innings in a no-decision versus Minnesota on Wednesday.
The 27-year-old was making a spot start after Carlos Rodon (shoulder) was placed on the injured list. Lopez pitched well, throwing 30 of 51 pitches for strikes while covering the most innings of any Chicago pitcher in the contest. He's mainly worked out of the bullpen this season with a 1.35 ERA, 0.75 WHIP and 22:5 K:BB across 20 innings. It seems more likely Lopez will return to the bullpen rather than stay in the rotation long-term.