"I have something very important to announce", he wrote on his official Twitter account.
The 35-year-old revealed on social media that he would be hanging up his boots after a glittering 18-year career.
His tweet announced that he would hold a press conference in Tokyo on Sunday.
He won his first major title with the Spanish giants when they lifted the Europa League in 2018, before joining Sagan Tosu in July that year.
Torres's time in Japan has not been an unqualified success and Sagan Tosu narrowly avoided relegation in his first season.
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He remains risky throughout, and I knew obviously once I gave away that lead things will get very, very tight and they did.
"What I'd like to do with Atletico, if I have a chance to go back, will be something so big that I'll need training for it", he said.
He joined Chelsea for £50 million in January 2011, but injury and form issues meant that he was never able to consistently reproduce those Liverpool performances at Stamford Bridge.
In 2011, he was signed by Chelsea for a then British record transfer fee of £50m.
Torres was a key member of Spain's 2010 World Cup-winning squad.
His return to Atletico Madrid had moments to be sure, including an 11-goal La Liga campaign in 2015-16.
He scored 38 goals in 110 appearances for Spain, making him the country's third-highest goal scorer behind David Villa (59) and Raul (44).
His career started with Atletico, before a £20m move to Liverpool in 2007, where he scored 81 goals in 142 games.