The forecast with which Barcelona works is for Vitor Roque to join in January, although for this they will have to considerably reduce the cost of the squad to make room for the Brazilian. Although the price of the transfer is high, the token is not so high, so the annual cost of the player in terms of Financial Fair Play (token of the player for the season plus annual amortization of the transfer price) is not as high as in other players. It will be, for example, less than the annual price of Gundogan.
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The catch 22 of the LaLiga salary rules. You can sign a player for free who costs the more in the salary cap, but you can't transfer in a player that will cost less on the salary cap.
So In the end you create a snowball effect that clubs can't sign high potential, sellable assets on lower contracts and instead have to sign older finished players on higher contracts.
The longer this goes on, the worse the league becomes and the less the clubs can earn from transfers.
WIth Saudi Arabia now appearing out of nowhere as an higher paying alternative for free agents, it's imperative for LaLiga to adapt and somehow find a way to give the clubs more liquidity in the market.