During the UEFA Champions League match on March 12, 2025, between Atlético Madrid and Real Madrid, a notable moment occurred when supporters of Costa Rican club Alajuelense displayed a flag in the stands of the Riyadh Air Metropolitano Stadium.

The match, which featured Atlético Madrid leading 1-0 at the time and tied at 2-2 on aggregate, saw the red and black emblem of Alajuelense prominently waved by fans in attendance.

The event was shared on social media, with regional sports networks highlighting the unexpected presence of the flag during one of football's most intense rivalries.

This incident caught the attention of viewers, who questioned the appearance of a Costa Rican flag at a derby match between two Spanish clubs.

The match is part of the knockout stage of the prestigious UEFA competition, intensifying interest and viewership globally.