The Merseyside outfit are aiming to go one step further than they did last season and lift the Champions League trophy, after having lost the final a year ago to Real Madrid.
UEFA said it does not comment on ongoing Financial Fair Play investigations.
"The New York Times report citing "people familiar with the case" is therefore extremely concerning".
"Manchester City FC is fully cooperating in good faith with the CFCB IC's ongoing investigation", a club statement to ESPN reads.More news: Rick And Morty Season 4 Finally Has A Release Date
Manchester City's Vincent Kompany lifts the English Premier League trophy after the English Premier League soccer match between Brighton and Manchester City at the AMEX Stadium in Brighton, England, Sunday, May 12, 2019.
One email exchange seen by Der Spiegel appeared to imply that while the total value of the Etihad airline's sponsorship of City had reached £67.5m (€77.8m/$87.4m), only £8m of this had actually been contributed by the airline, with Abu Dhabi United Group - Sheikh Mansour's holding company - topping the sponsorship up by nearly £60m over the course of six years.
City were fined £49million and hit with restrictions on transfer spending and the size of their Champions League squad after FFP breaches were originally investigated in 2014.
Kane, meanwhile, has missed Spurs' nine games since sustaining significant lateral ligament damage to his left ankle against Manchester City, and Spurs initially thought he would be out until the end of June.More news: Yikes, WhatsApp exploit allowed spyware to be installed with a phone call
City will become the first team in history to win a domestic treble when they beat Watford in Saturday's FA Cup final and I see them repeating this level success time and again over the next few years.
Klopp has given his team a few days off to recover from a gruelling Premier League campaign in which they pushed Manchester City to the final day in the title race, eventually losing out by one point.
Guardiola, meanwhile, was named the Premier League manager of the year at the League Managers' Association awards last night, topping the vote ahead of Liverpool boss Jurgen Klopp, Tottenham manager Mauricio Pochettino and Nuno Espirito Santo of Wolves.More news: San Francisco moves to ban use of facial recognition technology
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