Manchester City then quickly sold Mooy to Huddersfield Town for $17million.
Both City clubs are owned by the powerful City Football Group.
Postecoglou has been dragged into the drama due to his time coaching Yokohama F. Marinos in Japan between 2018 and 2021.
Yokohama F. Marinos are also owned by the City Football Group, who in total run 11 clubs across the world, although there have been no allegations levelled at the Japanese club.
Socceroos star Aaron Mooy was bought by Manchester City in July of 2016 – he was then sold to Huddersfield Town for $17million – the City Football Group own both Manchester City and Melbourne City (pictured, Mooy playing for Melbourne City in 2016)
The City Football Group also own Yokohama F. Marinos in Japan, who Ange Postecoglou coached between 2018 and 2021
So far, CFG have refused to answer any questions about the developing scandal.
It comes as the Premier League this week charged Manchester City with 115 breaches of the financial fair play rules for alleged financial misconduct between 2009 and 2018.
Points deductions, stripped Premier League titles and even relegation to the Championship in the UK are all possibilities if Manchester City are found guilty of falsifying their books.
According to the Herald Sun, a series of emails have revealed deliberate attempts to conceal money being paid directly by City Football Group.
Simon Pearce, vice chairman of Melbourne City, was allegedly named in the emails.
Manchester City players celebrate winning the Premier League in 2018 (pictured centre, former captain Vincent Kompany)
Manchester City are accused of breaching financial rules across nine seasons in the EPL (Sheikh Mansour pictured, speaking with club chairman Khaldoon Al Mubarak)
The emails, reportedly leaked to German newspaper Der Spiegel, detail claims the City Football Group, owned by the Abu Dhabi government, namely Sheikh Mansour, repeatedly breached financial fair play rules.
Subsequent emails to Pearce allegedly show attempts to conceal sources of money paid directly to Manchester City.
Melbourne City were previously embroiled in a financial scandal when Man City paid $300,000 to sign Anthony Caceres from Central Coast Mariners, only to offload the midfielder to their sister club for free.
It is alleged a number of sponsorship contracts were deliberately inflated to hide millions being paid by the owner, which is a direct breach of league rules.
Nine years ago, CFG – Manchester City’s parent company – bought A-League club Melbourne Heart and changed their name and colours.
It didn’t take long for the Victorian based club to become a dominant force in Australia, with Tim Cahill, arguably the greatest ever Socceroo, enjoying a stint at AAMI Park between 2016 and 2017.
Since 2014, the club’s men and women’s squads have won five grand finals (four women, one men), four premierships (two each) and one Australia Cup.
Shockwaves went around Europe after Manchester City were charged by the Premier League over 115 breaches of financial rules (pictured, manager Pep Guardiola)
World Cup match-winner Mat Leckie is still on the club’s books alongside Australian teammate Jamie Maclaren, with City also the current A-League men ladder leaders.
They sit in second spot in the women’s competition.
Melbourne City’s communications manager Dan Mellios did not respond to emails from Daily Mail Australia this week regarding the club’s current financial status.
It was the same story with Damaris Treasure, communications director at the A-League’s governing body the Australian Professional Leagues.
Treasure did not respond to phone calls, text messages or emails surrounding the alleged financial situation at Melbourne City.