A leaked audio taping has emerged of Real Madrid president Florentino Perez calling Cristiano Ronaldo an "imbecile" and Jose Mourinho "abnormal".

The tapes, which were recorded in 2012 and released by Spanish media outlet El Confidencial, follow on from a 2006 recording in which Perez dismissed Real Madrid legends Iker Casillas and Raul as "frauds".

In the latest recording, Perez attacks Ronaldo and although the context in which the recordings were made are unclear, the sentiment is obvious. "He [Ronaldo] is mad. This chap is an imbecile, he is ill," Perez said.

"Do you think this chap is normal? He is not normal, otherwise he wouldn't do the things he does. The last foolish thing he did, everyone around the world saw it."

The Real Madrid chairman had similarly scathing words for then-manager Mourinho: "These are guys with huge egos, both of them spoiled.

"He [Ronaldo] and the coach [Mourinho] don't see the reality because the two could earn a lot more money if they were different. They are both abnormal because we are talking about a lot of money in image rights."

Another recording of Perez captured him going on the offensive against Spanish media outlets Marca and Television Espanola.

"We have to win the battle of Marca and Television Espanola," Florentino Perez is heard saying in the clips.

"And with that isolate [them], not El Pais, which does not behave badly, but [then-director of AS, Alfredo] Relano and [the host of El Transistor on Onda Cero, Jose Ramon] De la Morena.

"El Rondo [a programme on TVE] will no longer exist. If it's for months, it'll be killed off in no time. If it's for seasons, we'll have to wait for the summer.

"We have nothing left but Marca. Now we have to take Marca," said Florentino Perez.

Perez has threatened legal reaction over the release of the recordings and claimed that they were released in an effort to blacken his name, following his role in the failed European Super League.

Perez said: "The comments are taken out of the context in which they were made. That they are reproduced now, after so many years, I believe is due to my role as one of the promoters of the European Super League.

"I have placed the issue in the hands of my lawyers who are studying possible legal action."