As we delve into this slideshow, it's important to define, first of all, what constitutes a "selling club."
It's a term that could be applied to those who have generated more transfer revenue than any other team, but it more accurately applies to sides who need to sell to survive and will wave goodbye to any player, no matter their skill, for the right price.
They could be clubs who have a production line of young up-and-comers who are regularly exchanged for handsome sums of money. Or they could fit the model of Udinese Calcio or FC Porto, who have scouting networks that reach far and wide, where emerging talent is bought on the cheap, nurtured and developed before being sold on.
The slides are arranged in an order from 13-1, which reflects the income these clubs have received from their sales over the last 10 seasons (including summer 2014).
All transfer data comes from Transfermarkt.