ATLANTA (Reuters) - FIFA president Gianni Infantino said the possibility of expanding the number of countries participating in the World Cup to 64 teams will be discussed after this year's tournament ends. The number of participating countries has been expanded to 48 teams for the first time in the North and Central America World Cup tournament, which is being held in Canada, Mexico, and the United States. Infantino told Swiss television channel Blue Sports: "All this will happen after the World Cup...