That is according to player-turned-pundit Stan Collymore.
The Argentina international fuelled the fire over suggestions he could quit the Etihad following the arrival of teenage sensation Gabriel Jesus.
Express Sport understands City will fight to keep Aguero at the club, even with Inter Milan ready to make a move.
Chelsea and Real Madrid have also been linked to the 28-year-old, who has been displaced in Pep Guardiola's first XI by Jesus.
Sergio Aguero has started the last two games for Manchester City on the bench behind Gabriel Jesus
Antonio Conte's Premier League leaders are said to be weighing up potential replacements at Stamford Bridge if Diego Costa exits Chelsea at the end of the season.
"You come to the realisation pretty quickly that you’ve still got something to offer so the best decision is to move," Collymore wrote in his Mirror column.
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Stan Collymore feels a return to Atletico Madrid would suit Sergio Aguero perfectly
Aguero will probably have had that conversation already with his agent and his family
"Aguero will probably have had that conversation already with his agent and his family. It is times like this a footballer has to think about themselves.
"He has got at least another three 20-goal seasons in him which is gold dust for a club.
"A return to Atletico Madrid where he would go back like the prodigal son would be hand in glove.
Diego Costa's future at Chelsea remains in doubt with a move to China possible in the summer
"I could see Chelsea wanting him, especially with these rumours about Diego Costa going to China refusing to go away.
"Whether City would sell to another English club is another matter.
"Even Barcelona or Bayern Munich could use him because he is a truly world class centre-forward."