Barcelona have to work on a price for Arthur, the Gremio midfielder who won the Copa Libertadores. The Brazilian club own almost all of his economic rights.
It's usual for players rights to be divided up in South America but Barça will only have to negotiate with Gremio, who they have already opened talks with.
Since Arthur signed a new contract in October, Gremio have had 80 percent of his economic rights. The business man Celso Rico has 10 percent and the player himself has 10 percent.
Arthur's deal runs until 2021 and his release clause is 50 million euros without exceptions.
It's normal for European clubs to ask players to give up on their percentage of the deal and for them to be compensated in terms of their salary.
Taking advantage of the leaked images of Arthur in a Barça shirt, various Gremio directors have made claims they want close to 50 million euros for the player.
The apparent anger, in reality, is just a show to start the negotiating from a strong point.
Barça, as explained by SPORT this week, have the player's word that he wants to move to Camp Nou, which they will use in the talks with Gremio.
The Catalan club -- nor any of the European clubs in for Arthur -- want to pay as much as 50 million euros. Gremio know that. As inflated as the market is, the path is marked by the 32 million euros Manchester City paid for Gabriel Jesus.