The Portuguese international terminated his contract with Sporting after the players were attacked at the training ground by a group of "ultra" supporters.
Patricio is facing legal action from Sporting, who do not believe their players have a legal right to terminate their deals.
Since he signed a four-year deal with Wolves, Sporting are asking the English club for €58.7 million.
"We can confirm that we have received a complaint from Sporting Clube de Portugal against Wolverhampton Wanderers 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."