While boss Pep Guardiola is keen to play down City's chances of a clean sweep of all four trophies, Aguero reckons it can be done.
Asked if the Quadruple was possible, Aguero, who has 26 goals already this season, said: “Always possible, always.
“Sometimes these comebacks happen. It's important that we've qualified for the semi-finals, so we're happy.
“We always believed it would come [against Swansea] and always we fight."