Paris Saint-Germain boss Laurent Blanc says the key to beating Real Madrid will lie in keeping "alien" Cristiano Ronaldo isolated.

The Portugal star has scored five goals in just two Champions League games this season and has 11 in 10 appearances in all competitions.

Rumours in France have emerged again linking Ronaldo with a potential future move to PSG, as the Ligue 1 champions seek a marquee signing to help them in their bid to become a dominant force on the continent.

But as PSG prepare to face Ronaldo and Madrid at Parc des Princes on Wednesday, Blanc says his focus is solely on stopping the 30-year-old in his tracks.

"He's one of the two aliens of planet football. He's good in every area. We have to make sure he has few touches of the ball. We have to keep an eye on him," Blanc said on Tuesday.

"People know our style of play. We like to have the ball. Real are quite defensive but they are very effective. These are two different philosophies that will now meet.

"If they want to give us the ball, we'll take it with pleasure. We meet a European giant tomorrow, but it won't be a decisive match. The decisive matches will come later, I hope.

"PSG are not yet a European giant, but we have the quality and motivation to win."