Jake Peavy remains on track to make his debut for the White Sox this coming weekend against the Royals. Peavy threw an important bullpen session on Sunday. "That's the best [session] so far," pitching coach Don Cooper told the Chicago Sun-Times. "An extended workout. Basically, the equivalent of four innings. Movement was outstanding. His curveball was good, his cutter -- he threw some of them -- was good. His fastball, changeup, went to a full windup, stretch, went over hitters. We really isolated the fastball more than anything. "You can speculate there's going to be a bullpen Tuesday or Wednesday [in Seattle]. You can speculate that he will be pitching two or three days after that bullpen." If Peavy doesn't feel good on Monday, the day following the workout, his timetable could be pushed back yet again. "I'm excited about it," Peavy said. "I know who I can be, and it's been frustrating to get there and jump right in and not ease into things. It's been different than what I've done in years past. [Sunday] was certainly the best I've been and felt, and hopefully that progresses."