The Spanish national anthem is expected to be whistled during Sunday’s Copa del Rey final with moves being made to guard against this.
It sounded very loud during Sunday morning’s tests at the Estadio Vicente Calderon with it audible from more than one kilometre away from the stadium.
The volume will be increased so that the whistles of disgruntled supporters will be drowned out.
The issue boils down to freedom of expression with the Copa del Rey generating controversy after an initial decision to prohibit the Catalan flag.
That decision has now been reversed but it still is expected to leave Barcelona supporters unhappy.
Interior Minister Jorge Fernandez Diaz spoke on Saturday about the dangers of mixing politics and sport.
“Football is football and politics is politics. This night should be a feast of football, nothing else. May the best team win.”