Aguero now has 13 goals for the season and looked in fine form.
The 24-year-old, a club record £38million signing two years ago, said: "Yes, I had a great game. The whole team played well though.
"The important thing was to win and we did. So now we will have a bit of calm and can concentrate on the Chelsea game.
"Yes, they were two good goals but the most important thing was they helped us to win. So I'm happy for the goals and for the win.
"I really like this cup, played as a single leg. Obviously if we maintain our concentration, I think we have a team that can reach the final."