#3 Sheikh Mansour (Manchester City) - £23.2 billion
Sheikh Mansour bought Manchester City in September 2008 and immediately transformed them into a global powerhouse in European football.
Mansour is the deputy prime minister of the United Arab Emirates and comes from the royal family of Abu Dhabi. He is also the chief executive of Abu Dhabi's Mubadala Investment Company and a board member of the Abu Dhabi National Oil Company. He also presides as the Chairman of the Emirates Nuclear Energy Corporation, Abu Dhabi Commercial Bank and Emirates Global Aluminium.
Since acquiring Manchester City, the 50-year-old has also brought New York City FC, Melbourne City FC and Mumbai City FC, among others, via the City Football Group.
The club's daily operations are entrusted to the trusted Lieutenant Khaldoon Al Mubarak.
Under Mansour's ownership, City have won several major trophies, including five Premier League titles. But the Champions League continues to elude them.
#2 Qatar Investment Authority (Paris Saint-Germain) - £220 billion
Presided by Nasser al-Khelaifi, Paris Saint-Germain is owned by the Qatar Investment Authority, a sovereign wealth fund of the country.
Al-Khelaifi was a very talented tennis player when he was young, having participated in two ATP Tour events. A career in Tennis brought Al-Khelaifi close to the Emir of Qatar, Sheikh Tamim.
Tamin, who was the head of the sovereign wealth fund, entrusted his long-time friend Al-Khelaifi with several senior jobs through the years in his companies.
In 2008, he was appointed as the chairman of the Qatar Tennis Federation. Three years later, Al-Khelaifi became the chairman of Qatar Sports Investment, a subsidiary of the Qatar Investment Authority. Said to be worth around £220 billion, it was designed to diversify the country's assets away from oil wealth.
The group decided to buy PSG in 2011, and Al-Khelaifi was immediately made the Chairman and CEO of the club.
Since the takeover, PSG have dominated the French League and even the transfer market, bringing in megastars to the club. The club made Neymar the most expensive transfer in football history by paying €222 million for him in 2017. They also managed to sign Lionel Messi on a free transfer during the summer.
Despite all the spending, just like Manchester City, PSG are yet to win the Champions League.
#1 Saudi Arabia Public Investment Fund (Newcastle United) - £320 billion
After 14 years of Mike Ashley's tenure, Newcastle United are now owned by the Saudi state's investment fund, making them the richest club in world football by a mile.
The Saudi Arabian Public Investment Fund invests on behalf of the government of the country.
After Ashley's poor reign at the club, Newcastle fans can be certain of big spending in the transfer market, with the gulf state one of the richest in the world.
The PIF boasts assets worth a staggering £320 billion, with stakes in companies ranging from Softbank to Boeing, Facebook and Uber.
But while the prospect of large spending may be exciting, some supporters are upset about the country’s appalling human rights record and are upset over the takeover.
Nevertheless, a new era has started for the Magpies and Newcastle will be keen to regain their former glory under the Saudi ownership.