These are the squads for the countries that played in the 1921 South American Championship. The participating countries were Argentina, Brazil, Paraguay and Uruguay. The teams plays in a single round-robin tournament, earning two points for a win, one point for a draw, and zero points for a loss.
Head Coach: n/i
Head coach: Ferreira Vianna Netto
Player , although called up, could not travel to Argentina.
Head Coach: José Durand Laguna
Head Coach: Ernesto FÃÂgoli