Boston Red Sox shortstop Stephen Drew is headed for Pittsburgh on Tuesday to be evaluated over the next two days at the University of Pittsburgh Medical Center's Sports Medicine Concussion Program. Drew has not played since March 7, when he was struck in the helmet by a pitch thrown by Twins pitcher Caleb Thielbar. At the time, Drew appeared OK. He remained in the game for another inning and did not complain of symptoms, but reported to the club the next day that he began to experience symptoms that night.