Agent Andre Cury has detailed how Barcelona are paying the fee of Vitor Roque.
The striker joined Barca in January from Athletico Paranaense.
"At the moment there's a queue of clubs that would be willing to sign him for 50m. Barca has only paid 10m so far, it's a detailed operation," said Cury.
Barca pays 5m every six months until they reach 31m permanently.
To meet all the variables, Vitor needs to be a starter. If he was a starter at Barca at 20, his valuation would be 200m.
Barca will also pay 1m if he wins the Ballon d'Or and 2-3m for being in the three best in the FIFA vote.
The rest comes from being a starter in half of the games ins his contract."