A few days later , Gimnasia was eliminated from the Copa Sudamericana by the Chilean champions Colo Colo , following a quarter final match where a player of Gimnasia was injured by a cement piece thrown by Chilean supporters . A few days later , Gimnasia was eliminated from the Copa Sudamericana by the Chilean champions Colo Colo , following a quarter final match where a player of Gimnasia was injured by a piece of cement thrown by Chilean supporters .