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4. Thiago Alcantara
Thiago Alcantara was an exciting prospect for Barcelona when he started out for the club and many great things were expected from the young Spaniard. But when Pep left Barcelona for Bayern Munich, he took Thiago along with him, for a meagre fee of £22.5 million which is considered by many as one of the worst sales in the club's history.
Ever since he left, the club was linked with the Spaniard on a regular basis and was looked upon as the player to succeed Xavi when he left. But it may be too late as Barcelona are set in their ways but had to end up spending a lot of money to obtain the likes of Arthur and Frenkie de Jong who will be joining in the summer.
Had Barca not sold him, they wouldn't have had to spend so much and could've been set for another one of their academy graduates to take the throne in their midfield.
