The Liga de Futbol Profesional (LFP) said on Monday it will mull a formal investigation over inappropriate chants of "Cristiano is a drunk" from Camp Nou fans during the Barcelona-Levante match.
The LFP said it will review videos, seen on social media, of the fans and present the evidence to the league's Anti-Violence Committee. This is not the first time the LFP has singled out Barcelona to the league's Anti-Violence Committee as chants made during Barcelona's match vs. Espanyol were also subject to a probe.
Ronaldo had been criticised for celebrating his birthday party following Real Madrid's 4-0 derby upset by Atletico Madrid.
The LFP has said it wants to apply the same yardstick that was used at the Bernabeu after derogatory chants toward 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.