Portugese goalkeeper Rui Patricio moved to newly promoted Wolves last month on a free transfer after tearing up his contract with Sporting Lisbon, but his former employers are not happy with the way the 30-year-old left the club and are demanding that FIFA discipline both Wolves and the player.
Patricio terminated his contract, along with nine other players after a group of 50 fans reportedly attacked Sporting players and staff in May after the club missed out on Champions League football on the final day of the season.
Sporting Lisbon are asking FIFA to investigate Patricio's transfer and are requesting that Wolves pay them around £50 million in compensation and that the English side be banned from signing players for two transfer windows. They have also asked for Patricio to be suspended for six months for his part in the deal.
The Primeira Liga club state that "Patricio left the club without previous agreement", and insist that the player “broke his contract”.
Wolves have declined to comment on the situation, while FIFA are said to be investigating the matter.