The Paris based club backed by billionaire Qatari investors are also ready to lure Real coach Jose Mourinho this summer in a whopping double swoop.
PSG president Nasser Al-Khelaifi wants to bring in the Portuguese duo, who have been expressed unhappiness with the current La Liga champions Real Madrid.
"I respect Real Madrid and their president. So if I want to have Ronaldo come to Paris, I will first call Real before engaging in any commentaries," Al-Khelaifi said in an interview with Le Parisien.
It would take a huge bid to lure the likes of Ronaldo, who had earlier mentioned that he would love to return to Manchester United. But the Red Devils would find it hard to raise funds to bring in the Portuguese.
Ronaldo, 27, was also unhappy with the way Real treated him and had even rejected a new contract extension offer from the club. The Portuguese is reportedly demanding nearly £400,000-a-week and PSG are willing to meet his demands.
The former Manchester United star wants to be the highest-paid player which is currently held by rival Barcelona star Lionel Messi.
Real Madrid, defending La Liga champions, are currently 16 points below Barca in the league standings and have already given up hopes of challenging for the title.
Such circumstances could also force Ronaldo and Mourinho to quit but they still have an eye on the UEFA Champions League and are drawn against Manchester United in the last-16.