10. Borussia Dortmund

Total debt: $82million

The Bundesliga giants were valued at $456million at the end of 2012/13, placing them in Forbes' list of the top 20 most valuable clubs in world football.

However, with debts that comprise around 18 per cent of Dortmund's total valuation, they are also one of the most debt-ridden clubs.

The German giants are in a significantly stronger position to the situation they found themselves in 10 years ago, though, when they were forced to frequently sell their star players in order to simply stay afloat.

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