During his documentary 'La Decision' which aired on Thursday evening, the France international explained that his choice was motivated by Atletico's renewed fight for the Champions League.
The club proved their ambitions by their competitiveness in the transfer market, where they have already made numerous renewals and new signings.
Before Griezmann's announcement, 'Los Rojiblancos' revealed a pre-agreement with Monaco for Thomas Lemar - a move which will shore up their offensive line going into next season.
The arrival of Diego Costa in January was also a major tipping point in the 27-year-old's decision. Given the two's previous partnership, it was a case of picking up where they left off rather than starting afresh.
However, the attack is not the only area being reinforced. Jose Maria Gimenez signed an extension on Wednesday, keeping him at the club until 2023.
Now the final piece of the puzzle could be goalkeeper Jan Oblak. The shotstopper's future has been up-in-the-air amid growing speculation linking him with a move away, but if Atletico can keep him at the Wanda Metropolitano, Griezmann will certainly feel like he has made the right choice.
With Diego Simeone leading the technical area and Diego Godin leading the team from the field, the La Liga side must feel they have a real chance to fight next season alongside their beloved Number 7.