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
Cardiff City is not a national football team but a club football team based in Cardiff, Wales. The club competes in the English football league system and has a significant history in Welsh and English football. While Wales has its own national football team, Cardiff City represents the city and its fans at the club level, participating in various domestic and international competitions.
Most likely the pittsburgh steelers
It could possibly mean that both the club and fans are united.
The German football team with the most fans is Bayern Munich. The club has a large global following, bolstered by its success in domestic and international competitions. Bayern's rich history, numerous championships, and star players have contributed to its popularity, making it one of the most recognized football clubs worldwide.
San Francisco 49ers
Dallas Cowboys
Brazil
PSG by a long distance