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#6 Roman Abramovich (Chelsea) - £10.5 billion
Chelsea's Russian owner Roman Abramovich bought the club in 2003 and immediately transformed them into one of the leading clubs in the Premier League and Europe.
Abramovich made a fortune in 1990s, initially trading timber, food products and even plastic ducks, but his biggest revenue came in petrochemicals and oil trading.
The 54-year-old was able to use the changing Russian economy to gain wealth in the 1990s, and in 1995 obtained a controlling stake in Sibneft, one of the country's largest oil companies.
Under Abramovich's ownership, Chelsea have won several major trophies including five Premier League titles, two Champions Leagues and five FA Cups.
#5 Andrea Agnelli (Juventus) - £14 billion
Andrea is the son of former Juventus chairman Umberto, and his family has a long history at the club, having managed the Bianconeri almost continuously since 1923.
The Agnelli family founded Fiat in 1899 and made a fortune in the automotive industry. The family also own Ferrari as part of the giant Exor group.
In May 2010, Andrea was appointed by his cousin as the chairman of the Juventus board and became the fourth member of the family to run the club. His appointment coincided with the club’s aftermath of the match-fixing scandal before being responsible for overseeing the transition to the new stadium.
Under Andrea Agnelli, Juventus won nine consecutive Serie A titles prior to losing their crown to Inter Milan last season. However, the club haven't lifted the Champions League since 1996.
Andrea was also the chairman of the European Club Association (ECA) before he resigned following the European Super League debacle.
#4 Dietrich Mateschitz (RB Salzburg/ RB Leipzig) - £15.7 billion
Austrian Entrepreneur Dietrich Mateschitz's journey to becoming a billionaire is a really fascinating one.
While on holiday in Thailand, Mateschitz came across the energy drink Red Bull. The drink was already popular among Thai workers following its invention in 1970s by businessman Chaleo Yoovidhya.
Mateschitz really became fond of the drink and as such, he reached out to the Thai company's founders. He was ready to offer them a 49 per cent share in the company if they were ready to let him tweak the formula and expand it globally. They gladly accepted his proposal.
He took it to the world, but it wasn't until 1997 when it was launched in the United States that the brand grew on a large scale.
Mateschitz invested his cash in sports, especially Formula One, but also ventured into football. In April 2005, he acquired Austrian team SV Austria Salzburg and later renamed the club Red Bull Salzburg. He also founded RB Leipzig in May 2009 with the club now becoming one of the powerhouses in German football.
