Mbappe is set to join Real Madrid when his PSG deal expires in June.
Gullit told : "Real Madrid is the biggest club in the world. If Madrid calls you, you almost always say yes, you don't say no.
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"I understand that Madrid wants to have the best player, so they went for Cristiano and other players like that. And I understand that Mbapp will believe that he can win with Real Madrid.
"He has already won much with PSG, but he wants the Champions League and perhaps he thinks it is not going to happen at PSG. I still think he can do it, I think they are a good team, but he has been there for a long time and will want to change."