Enrique Cerezo claimed Atletico Madrid have evidence Barcelona had agreed to terms with Antoine Griezmann before his release clause dropped to €120 million.
Barca confirmed the signing of Griezmann on Friday on a five-year deal after a solicitor representing the forward deposited money for his buy-out clause at La Liga headquarters in Madrid.
The signing ends an extended saga involving the Frenchman and Barcelona, as Griezmann previously denied the club last summer to remain with Atletico Madrid.
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That decision lasted just one year, as Griezmann announced before the conclusion of the La Liga campaign that he would leave the club at the end of the season before completing his move to Barcelona on Friday.