#1 Manchester United FC, €536 million
On one hand Manchester United became the first English team to earn over half a billion pounds in a single year last September. On the other hand, their debt rose by 25% to €536 million for FY15 and is a comfortable €200 million above the second-placed Benfica. However, the record revenues mean United are well placed to handle the massive debt.
Further, the £750 million deal with kit manufacturer Adidas over 10 years is a testament to their brand value and financial might. Barring a failure to get into Champions League for an extended period of time, Manchester United are and will remain a force to reckon with.
Also, the massive TV deal in England in itself is a huge financial asset to a club like United and sets them apart from clubs in other European leagues.