Atletico Madrid are “fed up” with Barcelona over their pursuit of striker Antoine Griezmann, and have demanded respect from the La Liga champions.
Speaking on Monday, Barcelona president Josep Maria Bartomeu said he met with Griezmann’s agent earlier this season.
Atletico reported Barcelona to Fifa over an alleged illegal approach for the France forward, 27, in December.
“We’re fed up with Barcelona’s attitude,” said Atletico chief executive Miguel Angel Gil Marin.
Marin added that Bartomeu’s comments about Griezmann in the build-up to the Europa League final between Atletico and Marseille on 16 May showed an “absolute lack of respect”.
He also accused Barcelona of “continuously pressuring” Griezmann throughout the season and said he told Bartomeu several months ago his “inappropriate conduct was against the integrity” of La Liga, given both sides were competing for the title.
Barcelona secured the title with victory over Deportivo La Coruna last month and are now three games away from going the entire league season undefeated, while Atletico are currently second.