Anthony Martial became the world's most expensive teenager when he signed for Manchester United.
Reports said the young French international cost United around £36m.
But the world didn't truly know how expensive the then 19-year-old Monaco striker was...until now.
Le Figaro have leaked official transfer papers between the Ligue 1 club and the Red Devils and it shows just how much Martial could come to cost them after add-ons.
Over the course of the season the papers show United agreed to pay €50m (£38m) for the star.
But they will have to stump up another €10m (£7.6m) if he scores 25 league goals, €10m if he wins 25 caps for France and €10m if he is nominated for the Ballon d'Or award. That could total upwards of £60m.
But it also details that if United sell Martial for more than €60m (£45m), then Monaco will get half of the capital gains as part of the deal.
Here is the contract in full...
