Osvaldo Ardiles
At the 1978 World Cup, Fillol wore the number 5 jersey, instead of 1 which is the standard for goalkeepers. This happened because Argentina, at that time, gave players their numbers alphabetically. The number 1 jersey was worn by offensive midfielder Norberto Alonso. For the same reason, Fillol wore the number 7 jersey at the 1982 tournament while Osvaldo Ardiles (another midfielder) wore the number 1. This practice was last permitted in 1986, when FIFA stated that the number 1 shirt should only be worn by goalkeepers.