Brian Roberts (concussion) indicated Monday that he is close to beginning a minor league rehab assignment. Nothing is official yet, but there's a chance it could happen within a week if he continues to make progress. He'll likely start out playing with Double-A Bowie, which is close to his home. While this is encouraging news, there's no timetable for him to rejoin the Orioles. Robert Andino, who is hitting .264/.314/.372 through 161 plate appearances this year, will continue to fill in at second base.