José Mourinho says he had one problem with Cristiano Ronaldo when he coached him at Real Madrid – he thought the world's most expensive player was a bit of a know-it-all.

Ronaldo joined Real from Manchester United for £80m in 2009 and took his goalscoring exploits to new heights under Mourinho, who left Real Madrid to rejoin Chelsea as manager earlier this week. Asked in an interview with the Spanish television show Punto Pelota why his relationship with Ronaldo had broken down towards the end of last season, Mourinho said the player had not taken criticism well.

"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," he said. "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."

Real's failure to win major silverware last season and reports of division in the dressing room have prompted speculation that Ronaldo, whose contract runs until June 2015, may be seeking a move away from the Spanish capital. But the club's president, Florentino Pérez, has said the 28-year-old will stay and help Real win the 10th European crown they have been chasing since their last continental success in 2002.

"Cristiano Ronaldo is priceless," Pérez, who was returned unopposed for another four-year term this week, told an internet chat organised by El Mundo newspaper on Tuesday. "We will do it (win the 10th European title)," he added. "And Cristiano will score a goal in the final."