Atletico Madrid president Enrique Cerezo said the club have "evidence" to back them in their dispute with Barcelona regarding Antoine Griezmann's transfer fee.
Barca announced the Frenchman's capture on Friday after activating his €120 million buyout clause, but according to Atletico, the club and player had agreed a deal before his clause was reduced from €200 million on July 1.
Cerezo told RAC1 (h/t Goal's Dejan Kalinic): "If the club have made this statement, it's because there's evidence. We have to study it, and we'll demand the amount we consider to be necessary."
Griezmann signed for Barcelona little more than a year after publicly deciding to stay with Atletico rather than join them:
Shortly after the announcement of his move, Atletico released a statement that read:
"Atletico Madrid considers that the deposited amount is insufficient to cover his buyout clause, since it is obvious that the agreement between the player and FC Barcelona was closed before the clause was reduced from €200 million to €120 million.