It represents yet another remarkable chapter in the career of the Spaniard, whose struggle for form has continued whilst in Serie A, with this transfer being confirmed a matter of days after his loan move from Chelsea to Milan was made permanent.
Torres's career has been in decline ever since he made an incredible £50 million switch from Liverpool to Chelsea in January 2011. Despite picking up FA Cup, Champions League and Europa League winners' medals, his goalscoring form never matched that during his days at his boyhood club and at Anfield.
So far this season in Italy, Torres has scored just the one goal in 10 appearances, and during his time at Chelsea he found the net on 45 occasions from 172 appearances.
Contrast that with his time at Anfield; where he scored 81 goals from 142 games - which followed his time at his boyhood club where he scored on 91 occasions from 244 appearances.
It seems to represent one last chance for the 30-year-old to get his career back on track under Diego Simeone at his boyhood club. Some will feel that combination will be his best chance to find some of his old form given the work the Atleti coach has done during his time at the Vicente Calderon.
Torres himself tweeted his delight, saying it was 'a dream come true' to return to the club he supported as a boy, and captained.
More to follow...