That is according to Fichajes.net.
"The Argentine international has been in superb form for City since signing from Atletico Madrid in 2011, and it has looked as though La Liga giants Real had been keen to bring him back to the Spanish capital next season.
"However, Barcelona are also keen on signing a new big name upfront, and could now look to table a big-money bid for 25-year-old by offloading a number of squad players such as Cristian Tello and Ibrahim Afellay.
"Aguero may be tempted by a return to Spanish football, and may also relish the opportunity to link up with his fellow countryman Lionel Messi at the Nou Camp."