Celtic Fc has the most fans followed by Rangers FC! mon the hoops:D
Panathinaikos
The Great LIVERPOOL FOOTBALL CLUB
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.
Manchester united
LIVERPOOL
Most likely the pittsburgh steelers
Scotland national football team was created in 1872.
PSG by a long distance
Michigan
The Pittsburgh Steelers, no doubt, they are everywhere!
San Francisco 49ers