The European "Super League" cannot use that name because Denmark already has a league called that, the Danish Super League said on Wednesday, citing an EU agency.
The league said that the European Union Intellectual Property Office (EUIPO) has ruled in favour of a complaint from the Danes and that a European Super League can not be registered under that name.
"We are very pleased that the EU's trademark authority has agreed with us that the trademark "THE SUPER LEAGUE" in the EU will infringe the value that the Danish clubs have invested in 3F Superliga," Super League director Claus Thomsen said.
He added that they have always opposed the big clubs' desire for a new European league.
"We believe there should be openness and qualification for international club tournaments via national championships. Football should not be a closed party for clubs that do not dare to participate in an open competition, so of course it makes us extra happy for this victory," he said.
An initial European Super League plan from 12 clubs in England, Italy and Spain flopped spectacularly in 2021 after fierce protests from many sides, but the idea is still being pursued mainly by Real Madrid and Barcelona, via consultancy A22.
The European Court of Justice (ECJ) ruled last year that governing bodies FIFA and UEFA do not have the right to stop other competitions or prohibit clubs and players from participating in them.
But the ECJ also said this ruling doesn't necessarily mean that a Super League will be approved.