The teams meet at the Etihad Stadium on Sunday, with the Blues hoping to close the gap on the Citizens to just one point.
City are currently on a three-game winless streak and are now 12 points adrift of leaders Manchester United.
And looking ahead to the match between the clubs second and third in the table, the Blues striker said: "The gap is very big between United and City, and we have in our head if we win we can get very close to them.
"We know this is not the best time for Man City at the moment and we're going to try and take advantage of that.
"It is going to be difficult to catch Manchester United because they are so many points clear from City.
"I don't see them losing that many points but we're just going to try and win the maximum possible and see where we will be at the end of the season.
"We can put pressure on City and if you beat big clubs you take more confidence so this is the objective."