The 32-year-old was moved by Real Madrid from Getafe for £8.4 million in July 2010.
But Leon made just 14 games during his only season at the Spanish giants, while Mourinho made it clear that he was troubled with the midfielder’s work levels in training.
When asked why Spaniard was left out of a Champions League line-up just months after his addition, Mourinho replied: ‘You talk of Pedro Leon as if he was Zidane or Maradona or Di Stefano, he’s a player who not long ago was playing at Getafe.
‘He’s not called up for one game, and it seems like you are talking about a great player.
‘When he works how I want him to, he will play, and when he doesn’t, it will be harder for him to play.’
However, Leon now requires that Mourinho denied to let him leave Madrid that winter, despite offers from Manchester City and Chelsea.
‘I had offers from City, Chelsea and Milan,’ Leon told Onda Cero.
‘Some wanted to sign me in the winter, but Mourinho didn’t let me go.’
Leon was also asked about the Portuguese manager’s brutal comments where he referenced Diego Maradona and Zinedine Zidane.
‘These are circumstances that could have been avoided,’ said Leon. ‘But I was not the only one to blame.’