"LOSC firmly condemns the unacceptable conduct witnessed, along with the hateful language and racist abuse from specific individuals in the away section during the trips to Belgrade and Strasbourg last Thursday and Sunday," the club stated in an official release.

"This type of conduct is intolerable and completely contradicts the principles the club consistently supports and promotes."

The announcement followed reports and video clips shared on social media that showed some Lille supporters making racist chants during Sunday’s 2-0 defeat against Strasbourg in Ligue 1.

Lille was defeated 1-0 by Red Star in the Europa League.

"Concrete actions were taken this morning. A process to identify those responsible is ongoing, aiming to file multiple complaints with the police," the club further explained.

"LOSC plans to pursue legal action against these individuals and request suitable penalties."