5. Victor Valdes
Victor Valdes does not always receive the credit or recognition that he so richly deserves.
His gifted teammates have taken most of the plaudits over the past decade, but without Valdes they might not have been so fluid.
The 31-year-old is the best goalkeeper in the world with the ball at his feet - and his distribution skills have instigated many Barcelona attacks over the years.
His decision to leave the Camp Nou at the end of the season leaves the Catalan giants with a huge task to successfully replace him.