Ryan started at second base on Saturday, and Girardi said that Roberts "is a player today for me in case of emergency." X-rays taken on Roberts' knee Friday at U.S. Cellular Field were negative.
"Any time you hit something off your kneecap, you worry about it; you're concerned you could have a crack or [it could] shatter," Girardi said. "It's a sensitive area, but for the most part, he feels pretty decent. He's sore, but there's really no swelling. Hopefully, we won't need him today and he'll be a player tomorrow."
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.