During his early career, Toselli represented Chile U17 at the 2005 South American U-17 Championship, playing in four matches. Later, Toselli was called up to the Chile U20 national team for the 2007 South American Youth Championship in Paraguay. He started in the national team as second goalkeeper until the third game of tournament, in where he relegates to the Colo-Colo player Richard Leyton to his place. Finally, Chile finished in the fourth place of the final stage of the tournament with six points alongside Paraguay, however the guaranies had a lower goal difference of Chile, giving the pass to Chile to the 2007 FIFA U-20 World Cup celebrated in Canada.