The Portuguese finds himself out of work after being shown to the exits at Old Trafford in December.
Calderon, though, believes that Mourinho may prove too costly for leading sides in Europe, while questions will continue to be asked of his behaviour and supposedly outdated methods.
"A club that has the possibility to win titles and also the money. I think he’s the most paid in the world nowadays. Not many clubs to go to now.
"It’s difficult to know how he is behaving. I remember, for us the greatest in our history is Alfredo de Stefano.
"He used to tell me [that] a great team, a great coach can never complain about referees, injuries, bad luck, the behaviour of some players. That’s something that belongs to the mediocre and I think he’s doing it.
"His record is incredible, difficult to match for any other coach, but his behaviour, I think he’s doing that so many times and that’s a warning for any team that’s going to hire him."
"When he was here, he was blaming everyone for the defeats. I think that is a grave mistake. It is a problem always.
"Also it makes a confrontation with the players and it’s been happening with Man United with [Paul] Pogba, with [Eric] Bailly.
"It was the same here, with Cristiano [Ronaldo], with Iker Casillas, with Sergio Ramos and I think that’s a problem, he’s always blowing his own trumpet and that for a coach I think is a big mistake.
"And, we have the example of [Zinedine] Zidane. He did completely the opposite. Backstage, he has been more with the team and that’s the way in my point of view to train a great team of great players. You cannot be the protagonist."
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