"He's still day to day, he's still a little stiff," Cubs manager Rick Renteria said Monday. "If it doesn't clear up, maybe we'll get an MRI to make sure everything's OK.
"He's doing fine," Renteria said. "We're just limiting him to make sure once he gets back on the field he doesn't have a setback."
Rizzo, who leads the Cubs with 30 home runs and 71 RBIs, was not available to pinch-hit Monday, Renteria said.
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.