Enrique Rojas of ESPN Deportes Los Angeles reports that the Royals, Marlins, Twins, Athletics, and Mariners are interested in free agent infielder Carlos Guillen. Guillen batted just .232/.265/.368 over 102 plate appearances this past season for the Tigers and probably can't be counted on for an everyday role at this point with his checkered injury past. The 36-year-old could be a low-risk, potentially moderate reward if he did manage to stay healthy, though.