Guardiola talked up the Frenchman ahead of tonight's Champions League encounter with Villarreal.
“Rayan is one of the most talented players I have ever seen in my career,” Guardiola declared.
“His talent… he is top. The question is how he settles and how he needs to read actions.
“He started well at the Club World Cup but then had a few weeks off. I have the feeling most of the time when the ball comes to him, the situation is better.
“But not all the time you have to do exceptional things - just play football. He has something.
“The pass for Erling (Haaland) in the last moments (against Everton), he can do it.
“He is a player who doesn’t feel pressure. He is like a street player.
“He wants the ball when he doesn’t have it.
“But he is here a short time - he needs a little bit of time because in football you learn to play with your mates.
“But these types of players are intelligent. They see everything.”