Portuguese side Sporting CP have filed a complaint with FIFA against goalkeeper Rui Patricio and new club ​Wolverhampton Wanderers, demanding €54.7m in compensation over the deal.

​Portuguese publication Record released a copy of the exten​sive legal document, filed through the law firm of Juan de Dios Crespo Pérez, a Spanish lawyer and specialist in sports law and contract litigation.

The 30-year-old shotstopper terminated his contract at the Portuguese club, citing just cause after he and his teammates were attacked by the club's fans at a bizarre training ground incident. Subsequently, Patricio has signed for ​Premier League new boys Wolves.

Sporting CP v SL Benfica - Primeira Liga

Patricio had played for Sporting since the age of 13, joining the first team when he was 18 - back in 2006. During his time with the club, he made 327 league appearances.

​According to the legal documents, Sporting arrived at the €54.7m fee they are pursuing due to an agreement by both parties involved - Sporting and representatives for Patricio - that the player's market value stands at €45m.

Added to this was then the remaining value of the player's contract at Sporting, which stands at €9.7m - totaling up to the sum the Portuguese club are pursuing against Patricio and Wolves.

There is past legal precedent for Sporting's claims too. ​One of the case law examples that Sporting point to in the document relates to Australian footballer Mark Bresciano and his controversial 2012 move from UAE side Al-Nasr to Qatari team Al-Gharafa.

In that instance, it was ruled that Bresciano unilaterally breached the contract he had with Al-Nasr in order to finalise the transfer - the same action Sporting are arguing Patricio has done to their club.

Bresciano was suspended for four months and fined €1.37m for the incident. While a ban is unlikely in Patricio's case, it does mean that there is legal precedent to strengthen Sporting's financial pursuits in the claim.

Sporting CP v Boavista FC - Primeira Liga

That could mean a significant financial outlay in the near future for Wolves, who may very well see a summer free transfer quickly become the club's most expensive transfer dealing.

Patricio had already been close to agreeing an €18m move to Wolves from Sporting prior to the training ground incident and the termination of the goalkeeper's contract - further adding to the Portuguese side's feeling that they lost out on valuable money.