French Uefa president Michel Platini was the man behind FFP.
Pep Guardiola has defended Manchester City in light of allegations the club breached financial fair play regulations and said they have to "accept it" if people claim they only win because of due to their spending power.
Der Spiegel is leading the Europe-wide publication of the "Football Leaks" documents.
Further leaks are expected in the coming days, but with City having worked so hard to improve their image, should these allegations prove to be true, it could be damaging to the Manchester City brand.
Some of City's sponsorship deals came under renewed scrutiny in Wednesday's instalment from Der Spiegel, which claimed that City remain sensitive to allegations of human rights abuse in the United Arab Emirates. The attempt to damage the club's reputation is organised and clear'.
City's Abu Dhabi owners are alleged to have reimbursed Fordham directly in a move which shaved millions off the club's wage bill and allowed them to report around £26m extra in marketing income. We want to follow all of FIFA's and UEFA's rules, there's no doubt about that.
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Gianni Infantino, the Federation Internationale de Football Association president, was alleged at the weekend to have struck a secret deal with the club when he was at Uefa which meant they avoided a Champions League ban. The club have also been cited in several Financial Fair Play allegations which Guardiola was asked about in yesterday's press conference ahead of the Champions League game against Shakhtar Donetsk, saying: "What I can say personally is of course I trust a lot with the club and what they have done".
City were fined 60 million euros by UEFA in 2014 for breaching those rules, but the two parties reached an agreement under which the club would get 40 million euros back if they stuck to the terms of their settlement.
The Catalan coach has delivered a combination of thrilling football and results as City romped to the title with a record 100 Premier League points last season. The Guardian has not seen or been able to verify the documents Der Spiegel has used in its reporting. "UEFA FFP compliance WILL NOT be achieved".
"We will need to fight this", Soriano wrote, according to the magazine, "and do it in a way that is not visible, or we will be pointed out as the global enemies of football".
PSG have already launched an appeal to the Court of Arbitration for Sport (CAS) against UEFA's re-opened financial fair play investigation. Usually clubs pay players for their image rights.
Der Spiegel said this helped turn nearly 30 million euros ($34 million) into revenue instead of a cost, for the objective of UEFA's investigation of club accounts.