A system malfunction led to the wrong anthem being played before Aston Villa's Champions League quarter-final second leg against Paris St-Germain.
The Europa League anthem was played over the PA system as the players lined up at Villa Park on Tuesday, before it was switched for the Champions League anthem.
The automated system responsible for playing the anthem crashed and was overriden by another system.
There is nothing in Uefa regulations regarding incorrect anthems being played, so Villa are unlikely to face any sanctions.
European football's governing body provides clubs with the relevant anthems but it is the responsibility of clubs to play them.