UEFA will open a Financial Fair Play investigation in to PSG, the governing body announced on Friday.
Neymar and Mbappé arrive at PSG
The Parisien club broke the world transfer-record to sign Neymar from Barcelona for €222m. PSG, backed by significant Qatari investment, also signed teenage sensation Kylian Mbappé on loan from Monaco, with a purchase option of €180m.
This level of spending has provoked speculation as to whether PSG will comply with UEFA's Financial Fair Play rules. The club already received a fine in 2014 for breaking the regulations.
UEFA's PSG statement in full
"The Investigatory Chamber of the UEFA Club Financial Control Body has opened a formal investigation into Paris Saint-Germain as part of its ongoing monitoring of clubs under Financial Fair Play (FFP) regulations.
The investigation will focus on the compliance of the club with the break-even requirement, particularly in light of its recent transfer activity.
In the coming months, the Investigatory Chamber of the UEFA Club Financial Control Body will regularly meet in order to carefully evaluate all documentation pertaining to this case.
UEFA considers Financial Fair Play to be a crucial governance mechanism which aims to ensure the financial sustainability of European club football.
UEFA will make no further comments on this matter while the investigation is ongoing."