When Barcelona tore Manchester United apart at Wembley to win their second Champions League in three years under Pep Guardiola in May 2011, few doubted that we were looking at a manager who would become the most successful the competition had ever seen.
Three years into his career in the dugout, Bob Paisley's record of three European Cups as a manager was already in Guardiola's grasp aged just 40.
It is remarkable then to think that not only has Guardiola failed to add to his European crowns as a manager in the last decade, but that Carlo Ancelotti and Zinedine Zidane have gone past him to join Paisley on three.