Aguero, off contract in June, has received a pre-contract offer from Barca this week.
Milito, formerly of Barca, told TyC Sports: "Barcelona are a perfect club for a player of Aguero's profile. I hope (Lionel) Messi can continue in Barcelona, with (Joan) Laporta this possibility is more feasible.
"For the Argentines, seeing Messi and Aguero playing together at a club would be a great satisfaction.
"For them, who started at the same time, it would also be a way to end their career well, although we hope that they will continue for a long time."