Barcelona's deal with Palmeiras over Vitor Roque's sale could reach as high as €31m.
Barca paid €30m to Athletico Paranaense over a year ago for Roque, with another €31m due in bonues - which were never met.
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Instead, Roque leaves for a fee of €25.5m plus €5m in bonuses.
Barca also retain a 20 per cent cut of any sell-on fee.
But there is more, as Barca can receive another €5m if bonuses in the contract are met.
They are divided into three parts: that the player is among the three best players in the World Cup, that Palmeiras wins the Copa Libertadores and the forward plays at least 60% of the matches as a starter and, finally, other variables linked to Palmeiras' results.