Atletico Madrid chief Miguel Angel Gil Marin attacked Barcelona on Tuesday over their pursuit of highly-prized striker Antoine Griezmann, saying he was "fed up" with the Catalan club's attitude.
Marin issued his strongly worded rebuke hours after a Spanish radio station reported that Barcelona were poised to pay the French international's 100 million-euro release clause.
The Atletico CEO said the club's stance was very clear.
"Not once have we negotiated for Griezmann nor do we have any intention to do so," he said in a statement issued on the team's official website.
"A few months ago, I personally expressed to Barcelona's president that our player isn't for sale nor are we going to sell him," he continued.
"At the same time, I let him know that his inappropriate conduct was against the integrity of the competition..."
"That a president, player and a board member speak the way they've done about the future of a player with an existing contract and just a few days before disputing a European final, is an absolute lack of respect towards Atletico."