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Of course, it could be argued that even Pep Guardiola was starting to lose his winning touch in his final season.
In 2011-12, nemesis José Mourinho finally overcame Barcelona, as Real Madrid won the championship for the first time since Guardiola had taken charge at the Camp Nou.
So it is ironic that now that Guardiola is gone and many are questioning whether this Barcelona team's glory days are behind them, Real Madrid are struggling quite alarmingly in La Liga.
Five games into the season, Real Madrid sit eight points off leaders Barcelona, with only two wins and notable defeats to Sevilla and Getafe.
In a title race between two such impeccable teams, any slip can be fatal. This early loss of points poses a monumental challenge for Real Madrid, and more specifically for José Mourinho.
If he can overcome it, and especially if he can guide the team to the Champions League glory they crave, Mourinho will prove he has not lost his winning touch.
Yet even then, the Portuguese manager seems to have lost the impervious quality that made Chelsea so reliably dominant during his tenure at Stamford Bridge.
One of Mourinho's strongest and most crucial traits then was his ability to manage a frankly difficult dressing room; to foster an unbreakable team spirit and inspire loyalty in his players.
That has not been the case at the Bernabéu.
Mourinho was embarrassed last year by a leaked training ground confrontation with Sergio Ramos and Iker Casillas. This year already, Cristiano Ronaldo has hinted at his unhappiness, and Mourinho has lashed out at his players in the media—an unthinkable state of affairs in his Chelsea days.
It seems the Special One has lost at least one aspect of his special touch.