Manchester City have been one of the Premier League's leading spenders since they were bought by Sheikh Mansour in 2008.
They've won two Premier League titles and the current squad assembled by Pep Guardiola are favourites to win the league this season.
The Citizens spent over £200m over the summer and La Liga president Javier Tebas urged UEFA to investigate Manchester City - and PSG - in accordance with the FFP [Financial Fair Play] regulations.
Both clubs were sanctioned in 2014 but Tebas believes UEFA were too soft.
He said: "If I remember correctly, PSG and Man City were sanctioned, but then the sanction was somehow reduced in some strange agreement that was not made public. La Liga at that time sent a letter to UEFA complaining about that situation.
"In our opinion, UEFA has not properly looked at the situation of Manchester City and PSG since that time or they would have sanctioned them again."
There is no question that Manchester City have splashed the cash in recent years, with fans often wondering if they're paying way over the odds.
It seems that fans aren't the only ones wondering, with one signing early in Mansour's reign suggesting he couldn't believe the fee City were willing to pay.
In an interview with Planet Football, Wayne Bridge admitted that he did not think he was worth the £12m Manchester City were paying to sign him in 2009.
"Even I pinch myself at the career I had and the money you can earn," said Bridge. but I almost find it embarrassing to talk about."
“When I was going for £12million to Man City I remember speaking to Jamie Redknapp about the price, and saying, ‘I think they’re paying too much.’
“He was like, ‘nah, you’re quality,’ but I didn’t see it."
Now aged 37, Bridge retired from professional football in 2014 after making 37 caps for England.
He started his career at Southampton before earning a £7m move to Roman Abramovich's newly funded Chelsea at the age of 23.
Bridge made 87 Premier League appearances at Chelsea during a six-year stay in London but was sent out on loan to West Ham, Sunderland and Brighton during his unsuccessful four-year spell at Manchester City,