More than 400,000 seats were left empty during the opening round of Club World Cup group matches in the United States.
Stadiums have been 56.8% full, with more than half a million spectators attending.
Nine stadiums have been used for the first 16 matches of the tournament, with a combined capacity of 979,373.
The total attendance at matches has been 556,369, with 423,004 empty seats.
The expanded tournament is being treated as a dress rehearsal for the international men’s World Cup next summer, which will be held in the USA, Canada and Mexico.
Of the 16 matches played so far, half of the matches have seen attendances below 50% of the capacity of the stadium.
The lowest attended game was South Africa’s Mamelodi Sundowns win over South Korean side Ulsan HD in front of 3,412 spectators at Inter & Co Stadium in Florida.
