Last summer, speculation was rife the forward would leave the Vincente Calderon for Spanish giants Barcelona.
Reports this week suggested Barcelona had triggered the Frenchman's £108million release clause after he informed the club about his desire to join the Catalans.
In the video, Griezmann went on to say that he chose to leave the club to seek a new challenge, and made the decision after a meeting with manager Diego Simeone and club CEO Miguel Angel Gil Marin.
Griezmann now has a £108million (€125million) release clause, a fee which was decided after he penned a new five-year deal last summer. "Thank you for everything", he said.
"Talks ongoing with the player about the contract to finalize the deal (5 years)".
Griezmann issued a statement on his imminent departure in a length video on Atletico's official Twitter account, in which he thanked the club's fans for all the support they've given him down the years.
"I have enjoyed a lot, I have left everything in the field, I have tried to behave well, I have tried to give joy to the people who have come to the Metropolitano and also away from home, and I only have gratitude for all of you".
"The truth is it has been hard to take this route but it is what I feel I need and I would like to thank all of you for the love you have shown me during these five years".
"I wasn't there on a day to day basis and I didn't know the decision he was going to make".
Don't count out the interest of teams like Manchester United, in need of a summer makeover, and Paris Saint-Germain if Neymar happens to leave, though that feels unlikely.
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