Football Leaks took to the internet as "an organisation created in search of the truth", convinced that "only by public pressure can you make a difference and uncover the hidden side of football".
It is a website that copies the structure of WikiLeaks, the website created by Julian Assange in 2010 in order to blow the whistle on political scandals and irregular behaviour throughout the world.
Here are eight of the most high-profile cases disclosed by the organization:
Falcao: The purchase price is around 50 'kilos'
Chelsea have been given until April 29 to notify the Monaco whether or not exercise the call option it has on the Colombian striker. The London club would have to pay 50 million euros to secure his services. He did not have to make any payment for the transfer of the player, just take over your salary, 185,000 euros a week.
Neymar: One million for promoting shampoo in Japan
In 2014 Neymar signed a contract under which it agreed to receive one million euros to advertise a brand of shampoo in Japan, China and Taiwan. To avoid surprises, the contract specifies that the advertised business should "promote products are consistent, high-quality, up to a talent like Neymar," as stated in the contract.
De Gea 10.9 'kilos' premium for signing for Madrid
The contract had linked to De Gea to Real Madrid would have been 'galactic' as revealed by Football Leaks. The agreement was extended until July 2021, with a salary of 11.8 million euros gross per year. With a 500 millions of out clause and a premium of signing for the player of 10.9 million. And 50% of his rights to images were for the club.
Bale: more than 100 million were paid to Tottenham
The final price of the Welsh was 100,759,417 euros, far from the 91 million who publicly said the Real Madrid entity. In point 10 of the agreement between the Spurs and Real Madrid by Welsh, Spanish club renounced collect payment pending the transfer of Van de Vaart to the London part. That deadline was valued at 2,625,000 euros.
Özil: It was sold with an 'anti-Barca'
Arsenal clause should report immediately to Madrid if you get an offer from a Catalan club and if they intend to accept it. Madrid had 48 hours of time to file, if deemed appropriate, an offer higher than the club concerned. Arsenal, as recorded by the contract, paid 44 million euros plus six variables fixed, a 'kilo' per season qualified for the Champions League.
Kroos 10.8 million gross and 300 clause
Real Madrid paid 25 million euros to Bayern Munich for his transfer. His salary amounts to 10.8 million euros per season and the price of their liberty, in case of unilateral termination before the end of his contract in June 2020 amounted to 300 million euros. And Madrid will have to play a friendly in Munich this summer.
Martial: A 'fragmented' signing of 80 million
Manchester United paid 20 million to Monaco in three post-business days in the Martial's registration. They must pay plus 30 million on 1 July 2016 and a number of variables: Checking 25 goals in three seasons at Old Trafford will be 10 million more. If he play 25 matches with France, another 10, and if he is a candidate for the Golden Ball much more.
Jackson Martinez: He received a 5% of the sale to Guangzhou
Atletico Madrid paid to Porto, as revealed by Football Leaks, 35 million euros in a single payment. Player signed a salary of 6 million euros a year (3.5 for month and 2.5 premium for having signed for Atlético). In addition, 5% would pocket in a future transfer (has been sold to Guangzhou the winter market).
Source: transfermarketweb.com