"To be honest, I hope not," Cubs manager Dale Sveum said. "It's not taking anything away from [Marmol] -- he's pitched good in what he's doing, but it would mean Gregg's not doing a very good job, and he's done a great job."
Fujikawa is no longer a factor. He was placed on the disabled list Monday because of a right elbow strain and will undergo Tommy John surgery.
Gregg, who allowed a run in the ninth inning of Thursday's 8-3 win over the White Sox, may do so well that he draws interest at the July 31 Trade Deadline.
"Right now, we're worried about today and I'm not worried about what happens at the Trade Deadline," Sveum said. "You can't do that."
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.