The Barcelona new boy's €800m release clause is larger than the €700m one for Lionel Messi, whose contract with the club will expire in 2021.
Atletico say they will take legal action against Griezmann and Barça in search for the additional 80 million after the player's lawyer, Sevan Karian, deposited his 120 million release clause with La Liga on Friday.
Griezmann has been a long-term target for Manchester United and but the clause could now price them out of any future deal.
The agent again spoke publicly, in this case to "RMC", and made sure to harshly criticize Barcelona's management for their ongoing transfer practices. He announced his departure from Atletico in May.
"The time has come to accept the challenge of a new destination".
'I'm very happy, ' he said. "I was told they have no intention of selling him, that Barcelona have not spoken to anyone and that stories to the contrary are simply not true", Joorabchian said, emphatically. You must tell the truth!
Griezmann scored 133 goals in 256 games at Atletico.
Mundo Deportivo also ran a story on Saturday, in which they claimed that Barca haven't received any concrete offers for Coutinho.
The French soccer star began his senior career in 2009 with Real Sociedad, before joining Atletico in 2014.
On Friday Atletico also unveiled Felix's former Benfica teammate Ivan Saponjic with the 20-year-old Serbian forward having signed a three-year deal with the Spanish club.
"FC Barcelona has paid the 120 million euro buyout clause to release Antoine Griezmann from Atlético Madrid", a statement read on their official website.
Despite struggling for club form, Barcelona will be encouraged by the Brazilian's performances for his country this summer, where he played a crucial role winning the nation's first Copa America title in 12 years.
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