Barcelona have announced they will fully cooperate with the Liga de Futbol Profesional (LFP) to identify Camp Nou supporters aiming derogatory chants at Cristiano Ronaldo, and will punish those found guilty.
The LFP will submit a formal complaint over chants suggesting Ronaldo "is a drunk" from some supporters at the Camp Nou during Barcelona's 5-0 win over Levante on Sunday.
News of the decision comes after the LFP said it would review videos, seen on social media, of the fans and present the evidence to the league's government-run anti-violence commission.
Ronaldo had been criticised for celebrating his birthday party following Real Madrid's 4-0 derby upset by Atletico Madrid.
Club executive Javier Faus is quoted by AS as saying: "We've put our security team at full disposition to assist with the LFP investigation. I'm not sure what the nature of the sanctions would be if found guilty as it's not my area, but they have our full support. We'll do all within our powers to help."
The LFP match observer for Sunday's game stated in his match report that a section of the fans in the Gol Sur section sang at a particular moment during the match "Cristiano is a drunk."
This report has been passed on to the Competition Committee, which may sanction Barcelona as a result of the incident.
This is not the first time the LFP has singled out Barcelona to the league's Anti-Violence Committee as chants made during a match vs. Espanyol were also subject to a probe.
The LFP has said it wants to apply the same yardstick that was used at the Bernabeu after derogatory chants about Lionel Messi were heard last year.
Last year's death of a Deportivo supporter, involved in fighting with Atletico Madrid fans before a La Liga match on Nov. 30, has led to a push to break links between radical supporters' groups and clubs by eliminating all forms of anti-social behaviour from the game.
LFP president Javier Tebas and government ministers Jose Ignacio Wert and Miguel Cardenal have all previously said that insulting chants and songs constitute "symbolic violence," which can lead to physical violence, while the official aim is to rid stadiums of all racist and xenophobic expressions.
Real Madrid, Barcelona, Deportivo La Coruna, Rayo Vallecano and Granada were all singled out last year by the LFP due to offensive chanting by their fans.