Barcelona filed a complaint with UEFA after PSG's supporters displayed a tifo they deemed "overly aggressive" before Tuesday's Champions League matchup. The Spanish club took formal action through the European governing body following the banner or display unfurled by the French club's fan base at the Parc des Princes.

This move reflects the ongoing tension between the two clubs, particularly after their recent encounters in continental competition. Barça viewed the tifo as crossing a line in terms of conduct and sportsmanship. UEFA now holds the responsibility of investigating the complaint and determining whether PSG's supporters violated any regulations regarding stadium conduct and fan behavior.

The incident adds another layer to what's already a heated rivalry. Both clubs have resources and history, which means these disputes tend to escalate quickly through official channels. Whether UEFA takes action depends on what the tifo actually contained and whether it violated specific UEFA regulations on offensive or discriminatory messaging. PSG will likely face questions about controlling their supporter sections, a persistent challenge for major European clubs managing passionate fan bases.