With Joan Laporta winning the presidential elections last weekend, there has been a few reports claiming he could convince Messi to stay with the club.
Similar to Messi, Aguero is set to become a free agent at the end of the season when his contract expires at the Citizens.
"Messi is in his last year of contract. There were elections last Sunday and a new president; all he [Joan Laporta] wants is to convince Messi to stay," Zabaleta told Forever Blue.
"One of the reasons to keep Messi is to bring Sergio to Barcelona. A few weeks ago, it was Messi to Man City because Sergio was there and it could be good for Messi to be reunited and to work with people he knows from Barcelona before.
"It's very difficult, there's a lot of media speculation. Sometimes when people ask me about what I think about these situations, I just try to think about what could be the best option for one of them, if they make a decision.
"We all need to respect and accept the decisions that they make at the end of the season, even for Lionel Messi - he's spent his whole life at Barcelona, it would be very strange to see Lionel Messi leave Barca. We all expect him to stay and never leave Barca.
"Nobody expected Barca to go into administration and to have problems with payments or big problems off the field that could make Messi want to leave the club."
