City trail leaders Manchester United by 12 points.
"We have to keep fighting until the end, that's my motto and that's the way we won the Premier League last season," Aguero said. "In football, everything is possible. We are still in a contest with Manchester United.
"We won the title off them last season and now we're in the fight again.
"We can regain the leadership of the Premier League from them. City have everything to grow and the best is yet to come.
"I say this because I feel the ambition of my team mates in the dressing room, in training and in matches."