Only one team in history has won the Treble (league, domestic cup, Champions League) twice, and that is Barcelona. From Pep Guardiola's magical side to Luis Enrique's destructive one, the Blaugrana dominated Spain and Europe for two seasons, and they continue to be favorites to win a treble of Trebles in the near future.
The club has assembled a fantastic squad for this season, and once all the pieces come together, we might be as well be looking at a third Treble in the current campaign. One of the best player in the Catalan giants' squad is Ivan Rakitic, who was part of the 2015 team that won the Treble in fantastic fashion.