#7 David Beckham - €37.5 million
Real Madrid signed Beckham in the summer of 2003 after offloading Claudio Makelele. Accommodating Zidane, Figo and Beckham in the starting lineup was a nightmare for the manager and it proved to be disastrous for Real Madrid as, during Beckham's time in Spain, Real won just one league title.
The fans though adored the Englishman not just for his footballing ability but also the endorsements he brought in. During his stint with the Los Blancos, the club's merchandising sales grew to over $600 million. But from a footballing perspective, the move backfired as Madrid could not utilize Beckham to his full capacity.
Zinedine Zidane had later said in an interview, "Beckham is the gold plating on a car, but what good is a car if its engine is sold?" He was referring to Makelele as the engine of Real Madrid whose sale resulted in destabilising the midfield.
Rating - 4.5/10