Madrid, Feb 18 (IANS): The anti-violence committee of the La Liga (LFP) has decided to open a case against FC Barcelona as the result of a song insulting Real Madrid striker Cristiano Ronaldo.

The song, which was sung by a sector of the crowd during Barcelona's 5-0 thrashing of Levante Sunday was "He's a drunk, Cristiano is a drunk". The song was in clear reference to Ronaldo's infamous 30th birthday party which was held just a matter of hours after Real had lost to Atletico Madrid the previous weekend, reports Xinhua.

The La Liga observer in the ground said he had heard, "the intonation of a song in a sports stadium in the 65th minute of the game and from a group of supporters following the home team -- a group of approximately 200 people".

"The fans initiated the following song 'He's a drunk, Cristiano is a drunk' in reference to the Real Madrid players, Cristiano Ronaldo in a choral, coordinated and repetitive manner," the committee's report revealed Tuesday.

Barcelona could now face a fine for the song, while anyone identified as having taken part in the singing probably faces a fine and a probable stadium ban.

This is part of the crackdown on fan behaviour in the wake of the death of a radical supporter of Deportivo la Coruna in a fight against Atletico Madrid radicals ahead of the game between the two sides Nov 30 last year.