Aguero revealed earlier this summer that he wanted to leave Vicente Calderon, and he has been strongly linked with Real Madrid, as well as Chelsea and Manchester City.
However, his father was quoted earlier this week suggesting that his son could yet remain.
But speaking from his homeland, where he is taking part in the Copa America, Aguero underlined his desire to find a new club.
"I will not return to Atletico, it is clear," he told ESPN.
"I talked to the club, gave a statement, now my representatives are negotiating my departure from the club.
"I don't know when the agreement will be, but I will know when the Copa America is finished."
Source: Team Talk
Source: Team Talk