Few clubs in world football are capable of stumping up the cash for the world's most expensive player, who has been at the Spanish club since his £80million move from Manchester United in 2009.
And speaking to L'Equipe, Leonardo suggested that, as part of the select group, PSG would be keen on striking a deal.
He said: "Cristiano Ronaldo? Paris St Germain have become a club where anything is possible. However, he still has an ongoing contract with Real Madrid and we have to realise that he will not leave Madrid for just any club.