Showalter said giving Tillman a few extra days of rest was a precautionary move after discussing the issue with team athletic trainer Richie Bancells. There's no set timetable on his next outing.
"He felt it a little bit about a week ago and Richie and them treated it and everything, and it went away," Showalter said. "And then today he told Richie he felt it a little bit in the morning. And in talking to Richie we decided to be careful with it."