Atletico Madrid president Enrique Cerezo has said "there will be consequences" if it is discovered Barcelona agreed to sign Antoine Griezmann back in March, when his release clause was still set at €200 million (£180 million).
Barca are expected to complete the long-rumoured signing of the French forward in the coming days after his release clause dropped to €120 million (£107 million) at the beginning of the month.
Per MailOnline's Pete Jenson, though, Cerezo has hinted there could be problems if Barca are found to have agreed a pre-contract agreement with Griezmann before the buyout fee dropped:
"The truth is I don't know, but if it is as you say and he had already signed then there will be consequences. It does not seem normal to me, but I do not know if he has signed or not or if he is going to Barcelona or not. I suppose in a few days we will find out."
Europe vs. South America—Who Would Win? We Simmed on FIFA17
Inside Transfer Deadline Day: Access All Areas at Sheffield United
FIFA Sim: Could a Team of Messi’s Left-Footers Beat Ronaldo’s Right-Footers?
FIFA Sim: Bundesliga All-Stars vs. Serie a All-Stars
Meet 'Billy the Wonder Kid': the 7-Year-Old Football Phenomenon
Juventus vs. Real Madrid: Champions League Final Goes Space Invaders
Xavi Quentin Simons Is Barcelona's 13-Year-Old Midfield Powerhouse
Gianluigi Buffon Is an All-Time Great: Will He Finally Win the Champions League?
Duong Ly Picks Football's Biggest Results: Who Wins the Champions League Final?
Can Real Madrid Unlock Juventus' Defense in UEFA Champions League Final?
FC Copenhagen Fans Throw Beach Toys on Pitch During Final Match of Season
Goodbye to Tottenham Hotspur's Famous Old Stadium—White Hart Lane
Blue Is the Colour—B/R Animation Celebrates Chelsea's Title
Lyngby Goalkeeper Makes Incredible Goalkeeping Blunder
We Asked Fans in Egypt: Who Is Your Champions League Legend?
Here Is What Happened When the Champions League Trophy Visited Egypt
When the France international announced back in May that he would leave Atleti this summer, it was widely reported Barcelona would be his next destination.
Atletico are likely looking to get as much money as possible for their star player, especially having just signed Joao Felix from Benfica for £113 million.
Per Spanish football writer Dermot Corrigan, they may attempt to get Barca to pay the original €200 million fee if they can prove an agreement was in place before the clause decreased:
Griezmann, 28, joined Atleti from Real Sociedad in 2014 for €30 million (£24 million) and has arguably been the club's most important attacking player ever since:
Barcelona look to be on the verge of snapping up the 2018 FIFA World Cup winner.
But Cerezo and Atletico are clearly not going to let Griezmann go easily as they look to make as much money as possible from their prize asset.