Barcelona are reportedly interested in bringing Alexis Sanchez back to the Nou Camp in January on a loan deal. Sanchez played some of his best football at Barca before leaving for Arsenal in 2014.
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Aguero had been signed by Barca during the summer to be their new central striker, alongside Memphis Depay.
But health issues meant he was forced to tearfully retire from football at the age of 33 on Wednesday.
He said: "When they did the first physical test on me in the clinic, the medical staff called me to tell me there was a very big possibility that I wouldn't be able to keep playing.
"From that point I was processing it all but it wasn't easy. One of the doctors told me straight up, 'that's enough'. I want to tell everyone that I did everything possible."