The Real Madrid duo have been linked with a possible switch to the Ligue 1 outfit, who are looking to announce themselves as a major European force.
Both men have hinted that their futures may not necessarily lie at the Bernabeu.
Ibrahimovic, who joined Les Parisiens in a big-money move from AC Milan last summer, said that he would welcome the pair's arrival at the Parc des Princes, but stressed that it is not yet a "reality".
"That would be great news for any team as Mourinho is a great coach, among the best in the world, and Cristiano Ronaldo is also among the best players around," Ibrahimovic told Marca.
"But at the moment that is not the reality. People can dream about their arrival and speculate, but until it happens you cannot give an answer."
Ronaldo has scored 21 goals in 21 La Liga games this season.