Manchester United will pay Ajax a staggering £56,000 bonus every time Lisandro Martinez plays for the club.
United have handed the Amsterdam giants £48.3million for the 24-year-old Argentine defender plus a package of add-ons worth £8.5million.
But the deal is structured so that Ajax will cash in for every appearance Martinez makes for the Reds up to a maximum of 30 games-per-season.