Lopez was still feeling pain in his right side Friday, a day after he was removed from a start, Daryl Van Schouwen of the Chicago Sun-Times reports. The right-hander pitched just 4.1 innings before his removal Thursday.
Manager Rick Renteria doesn't feel the injury is serious, but the White Sox will be cautious with one of their top pitching prospects. If the pain doesn't subside in the next couple of days, it's very likely Lopez won't make his scheduled start Tuesday.