It was confirmed this afternoon that the footballing governing body had opened up a Financial Fair Play investigation into the Ligue 1 giants "in light of recent transfer activity" after they signed Neymar for a world record fee of £198m (€222m) from Barcelona as well as securing a loan deal for Kylian Mbappe.
UEFA's Financial Fair Play (FFP) regulations were introduced by its former president Michel Platini in a bid to ensure clubs lived within their means and only spent in proportion to their revenue.
In the coming months, the Investigative Chamber of the UEFA Club Financial Control Body will meet regularly to carefully evaluate all the documentation relating to this case.
"The Club is surprised by the fact that it has constantly kept the UEFA Financial Fair Play teams informed of the impact of all player operations carried out this summer, were obliged to do so".
"UEFA will make no further comments on this matter while the investigation is ongoing".
Friday's announcement from European football's governing body said it would look at whether PSG had violated the regulations, which are created to prevent football clubs spending more than they earn. He scored 15 goals and registered eight assists in the league, while scoring another nine goals in the Champions League and cup competitions during the 2016/17 season.
However, Mbappe has revealed he signed for Monaco's league rivals PSG as he wanted to be "part of the club's project, which is one of the most ambitious in Europe", according to a statement. "Alongside my new teammates, I intend to continue my progression while helping the team achieve the very big objectives it has set itself", Mbappe pointed out.
The French club shattered the previous global transfer record earlier in August when they splashed out a staggering 222 million euros to prise the Brazilian superstar away from Barcelona. Mbappe was expected to join as recently as last week, but the move only just made it through before the transfer window shuts at midnight Thursday.
He then picked out an overlapping Djibril Sidibe who quickly returned the pass to see Mbappe fire a first time shot low into the bottom corner. "The global French striker is transferred on a loan basis from AS Monaco until June 30 2018", PSG said in a statement. It will argue with justification that the signing of Neymar, in particular, and now Mbappe has hugely raised the profile and interest in the club and is attracting commercial partners.