Willem II, who sold De Jong to Ajax for 1€, stand to make 7.5 million euros

The Dutch club sold the teenager to Ajax for a euro in 2015, but reserved 10% of his future transfer and will receive a windfall which will eclipse their annual budget.

According to 433, a few years ago, Ajax paid Willem II the princely sum of one euro for a player in their youth team - Frenkie de Jong. The teenager started out with the reserves, Jong Ajax before making his first team debut in September 2016.

De Jong off to Barcelona

Since then the young midfielder has gone from strength to strength - signing a transfer deal with Barcelona earlier this week which will be made effective from 30 June. The Catalan club will pay Ajax a fixed transfer fee of 75 million euros plus a further 11 million in add-ons.

And 433 add that when they sold De Jong three and a half years ago, Willem II withheld a 10% stake in any future transfer of the player, which means they stand to receive 7.5 million euros (or 6.4 million euros as 433 understand it). In any case, the Dutch side are set to receive a fee in excess of their annual budget. A bit of business which at the time might have seemed crazy by the club who currently sit ninth in the Eredivisie, could turn out to be highly profitable.