Jose Mourinho has taken a swipe at Real Madrid star Cristiano Ronaldo, describing the forward as a bit of a know-it-all.
Mourinho revealed that his relationship with Ronaldo broke down towards the end of last season after the former Manchester United player reacted badly to criticism.
The Chelsea manager told Spanish television show Punto Pelota: "I had only one problem with him, very simple, very basic, which was when a coach criticises a player from a tactical viewpoint trying to improve what in my view could have been improved.
"And at that moment he didn't take it very well because maybe he thinks he knows everything and the coach cannot help him to develop more.
"Cristiano has had three fantastic seasons with me, I don't know if they were the best of his career because he had some fantastic moments with Manchester United.
"I think we created a fantastic situation for him tactically in which he could express all his potential and turn that into records and goals."
Mourinho left the Bernabeu after failing to win major silverware last season and amid reports of dressing room unrest, and Ronaldo has also been rumoured to be seeking a transfer away from the Spanish heavyweights.
However, Real president Florentino Perez said the 28-year-old is going nowhere and will help the club win the Champions League next season.
"Cristiano Ronaldo is priceless," said Perez. "We will do it (win the 10th European title), and Cristiano will score a goal in the final."