However, Atletico believe the France worldwide agreed to terms with Barca before his clause dropped from €200 million on July 1 and therefore claim they are owed an additional €80 million to ratify the transfer, they said in a statement.
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.
The four aforementioned players do not have the full confidence of Barcelona coach Ernesto Valverde. PSG's director Leonardo said that the Brazil worldwide will be allowed to leave the club once an appropriate offer comes, but the club is expected to play hardball if Barcelona try to make a move for him.
However, the 2018 World Cup victor spent only one more season with the Rojiblancos before announcing in May that he would be leaving the club this summer.
Atletico finished second in La Liga last season, nine points behind Griezmann's new club.
Griezmann joined Atletico from Real Sociedad in 2014 and scored 133 goals in 256 appearances.
"Atletico believes that the termination of the contract happened before the end of the last season and therefore has initiated procedures it has deemed appropriate to protect their rights and lawful interests".