FIFA has confirmed an investigation is underway after Sporting CP complained about Rui Patricio's transfer to Premier League new boys Wolves.
The Portugal international signed a four-year deal at Molineux last month after terminating his Sporting contract in the aftermath of an attack by a section of the club's supporters following their failure to qualify for the Champions League.
The letter, published by Record, states Sporting are seeking €58.7million from Wolves, while also requesting the club are handed a transfer ban and Patricio is suspended for six months.
Football's governing body verified receipt of the dossier from Sporting and advised a full investigation was now underway.
"We can confirm that we have received a complaint from Sporting Clube de Portugal against Wolverhampton Wanders and the player [Patricio]," a FIFA spokesperson told Omnisport.
"As the contractual dispute is currently under investigation, please understand that no further comment can be made at this stage."
