#10. Borussia Dortmund
Dortmund’s rise in popularity in recent years has been one of the stories of European football. Jürgen Klopp lifted the club to back to back league titles, keeping the giants of Bayern Munich at bay and capturing the hearts of many football fans along the way, never more so than when they reached the Champions League final to Bayern. They are a big football club but still lose their best players to the giants of Europe. They have consistently had the second highest average attendance in Europe behind only the Spanish giants Barcelona, which is testament to their fanatical support.