Barcelona have formally reported Paris Saint-Germain to UEFA following the tifo displayed by the French club's supporters ahead of Tuesday's UEFA Champions League encounter, a source has told ESPN.

The dramatic visual display, put on by PSG fans before the two sides met, has been deemed "overly aggressive" by Barcelona, prompting the Spanish club to escalate the matter to European football's governing body.

The complaint adds another layer of tension to what is already a fiercely contested rivalry between two of the continent's most powerful clubs. The incident marks a rare step by a club to formally challenge the behaviour of opposing supporters through official UEFA channels.

UEFA is expected to review the complaint and determine whether disciplinary action is warranted against PSG in connection with the tifo display.