Their remarkable run of success simply has to come to an end eventually, and there are concerns that their style of football -- epitomised by the ageing Xavi Hernandez -- is already outdated.
Spain followed the Barcelona way of playing to win the 2010 World Cup and Euro 2012. In the latter tournament, they ultimately triumphed in style, destroying Italy 4-0 in the final, but the sterile way in which they dominated earlier matches led many to label Vicente del Bosque's side boring.
The Catalans' possession-based game, popularly known as 'tiki-taka', was made to look utterly one-dimensional as they were taken apart by Bayern Munich, all power and fast transitions from defence to attack, in the Champions League semi-finals in 2013.
Fast forward a year and Bayern, with Guardiola in charge, were playing the 'tiki-taka' and being torn apart on the counter-attack by Real Madrid at the same stage. Recently, as a result, it has become popular to mourn the death of that style.
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Jose Mourinho has taken things to extremes at times. His approach is often that if you willingly renounce possession you will make fewer mistakes and therefore win the game.
But to say that 'tiki-taka' is dead is to jump to conclusions. After all, until 2011, Guardiola's Barcelona mixed their mesmerising short passing with a crucial element, a high-energy pressing game. And Guardiola's Bayern won the double in Germany in the season just finished.