Ryan Sweeney, who was placed on the disabled list May 3 with a strained right hamstring, took a "step back" in his rehab, Cubs manager Rick Renteria said. Sweeney was injured chasing a fly ball against the Cardinals on May 2.
Both Sweeney and Ruggiano have been rehabbing at the Cubs' complex in Mesa, Ariz. Renteria did not believe Sweeney had re-aggravated his leg seriously.
"He just probably felt it a little lightly," Renteria said. "He's been doing great."
There is no timetable for the outfielders' return.
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.