Panathinaikos
That is debatable. Michigan has had the most fans in a stadium in a game, and there are fans growing everyday.
Persepolis is the greatest pro football team.
LIVERPOOL
It could possibly mean that both the club and fans are united.
Most likely the pittsburgh steelers
Brazil
San Francisco 49ers
Dallas Cowboys
Michigan
PSG by a long distance
Celtic Fc has the most fans followed by Rangers FC! mon the hoops:D