3. FC Porto
Porto have done a rather good job in recent seasons of acquiring players on the relative cheap before selling them for huge fees once they have provide service of note for the club.
Radamel Falcao, Hulk, James Rodriguez and Joao Moutinho all performed to distinction for Porto before they were sold when an offer was made that proved too good to resist.
Falcao left for Atletico Madrid for around €40 million, Hulk was signed by Zenit for €60 million while Rodriguez joined Monaco along with Moutinho for a combined €70 million.