Former Real Madrid president Ramon Calderon has described Jose Mourinho as a moaner, suggesting the club would be better off under the yoke of "exemplary" Pep Guardiola of Barcelona.
His message comes just days before the two great rivals square up in the fight for la Liga in Saturday's Clasico. The fixture is the first of four derbies between them, with a further one in the Copa del Rey final, and then two more in the Champions League semi-finals.
However, Calderon claims Mourinho's complaints could be detrimental to success this season.
"I think his complaints about the fixture dates were a joke. He already used that one in England, but that's just the way he is," he told Sport.es, referring to Mourinho's complaints about the Liga calendar earlier this term.
"He does well on the pitch, but his complaints are unjustified. A great team cannot always complain against referees, bad luck or injuries.
"Guardiola on the other hand has good behaviour and attitude. He is exemplary."
Plenty is at stake over the next month, with Real Madrid fighting the Camp Nou giants for the title, Copa del Rey and a place in the Champions League final. Calderon feels the Catalans may edge it across the board.
"Both teams are very good. It is true that Barcelona have scored fewer goals and that can encourage Real Madrid, but they have two different styles. Barca move the ball more, and Real Madrid are more direct," he added.
"To be crowned European champions you need to win all your games, but Barcelona are playing well, and they will be difficult to beat."
The second league Clasico of the season kicks off at 22:00 CET on Saturday night.