Football_in_Argentina Football is the most popular sport in Argentina, it has more registered players than any other sport (540.000 in 2002, equivalent to 1.4% of the population) and it is the most popular recreational sport played from childhood into old age. The percentage of Argentines that declare allegiance to an Argentine football club is about 90%.Football was introduced to Argentina in the latter half of the 19th century by the British immigrants in Buenos Aires.