The France worldwide has always been a target for the Catalan club and Barcelona director Guillermo Amor told Spanish media on Sunday that president Josep Maria Bartomeu may have made contact with Griezmann's family, who are also his representatives, over a potential move.
But Atletico are unimpressed with Barca's courting of the 26-year-old, with the capital club alleging illegal contact has been made between the two parties and Federation Internationale de Football Association confirmed to Omnisport that a complaint has been received on the matter.
The Catalan giants are expected to be willing to pay the French international's 100 million euro ($117.8 million) buyout clause at the end of the season to avoid negotiating with Atletico. "In Griezmann's case, there are many people we talk to; it's our obligation to have contact with players".
"Griezmann has a long contract and this cannot be permitted, while the club also considers it could affect the competition [La Liga] in which Barcelona are now top and Atletico are second".
"Barcelona have not negotiated with any player, so we understand that no irregularity has been committed", a club spokesman told MARCA.
Speculation regarding Griezmann's future had been growing in recent days after reports suggested that Barca president Josep Bartomeu met with the player's family. "He is a player under a long contract and this can't happen".
Atletico manager Diego Simeone also admitted recently that the attacker would be allowed to leave the club "at some point". A switch to Old Trafford will help him play alongside his compatriot and friend Paul Pogba.
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