"It's just some back spasms. He's much better," Girardi said. "I just would probably stay away from him today and see where we're at [Thursday]."
Roberts said that he came to Yankee Stadium on Tuesday and played catch, in addition to doing cardio and core exercises. Roberts planned to hit on Wednesday, and he said that he could have played if needed.
"I took a bunch of swings Saturday morning. I was trying to get things going," said Roberts, who is off to a 4-for-31 (.129) start at the plate. "Maybe I should have just stuck with where I was."
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.