The Atletico Madrid forward is attracting interest from a host of top sides across Europe.
Despite having an £86m release clause and Griezmann insisting he’s happy in the Spanish capital, Atletico face a tough fight on their hands to keep hold of him.
And Eric Olhats, a sporting adviser to Griezmann, has confirmed the clubs who have made enquiries for his services.
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"There is not 50,000 clubs that can put 100 million on the table,” Olhats told French publication RMC.
“It is the price of the clause, it restricts the number of the current candidates.
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“I heard that Manchester United was officially recorded, it was signed, but we do not even know if they will play in the Champions League!
“It's Manchester United, they have taken information, like all the others.
“They come to know what is our state of mind, the mindset of the player, if there are possibilities.
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“Chelsea, Manchester City, Barcelona and even Real have tapped the door to find out.”
However, Olhats insists Griezmann won’t be making the switch to arch-rivals Real Madrid.
"It's impossible, there's a non-aggression pact, there's a deal between the two clubs that does not touch each other," he added.
“It's not on the agenda. Between the two clubs, there's something that's been around for a long time."