UEFA has opened an investigation into Paris Saint-Germain's transfer dealings with regards to Financial Fair Play (FFP) rules.

But PSG say they are "surprised" by UEFA's decision and have "always operated with total transparency".

The Ligue 1 club paid a world-record fee of £198m to sign Neymar from Barcelona last month and agreed a season-long loan for Kylian Mbappe that contains an obligation to buy the forward for £165m in 2018.

FFP rules require clubs to more or less break even over a period of three years and PSG will pay Neymar £515,000 per week over the course of his five-year contract, which could take the total cost of the Brazilian to £500m

PSG accrued about £50m from selling players this summer and UEFA says it will put the club's books under meticulous scrutiny over the coming months.

"The investigation will focus on the compliance of the club with the break-even requirement, particularly in light of its recent transfer activity," a statement read.