FIFA will hear Shakhtar Donetsk's case today against Real Zaragoza over their signing of midfielder Matuzalem.
The Brazilian joined Zaragoza in the summer on a free transfer, but Shakhtar are demanding £17 million in compensation claiming that the Spanish Liga club encouraged the player to terminate his contract.
Zaragoza are calm about the situation and even if Shakhtar find a ruling in their favour, cannot expect more than £3.5 million for Matuzalem as he had only a year left of his contract to run.