Aguero, who has scored nine goals in five games and is poised to return at Swansea on Saturday after serving his suspension, must pull his weight in other areas.
Guardiola said: "Of course the striker has to score goals. I am so, so happy with Sergio but I want more. He can do better.
"I don't want Sergio to run too much without the ball - I don't want him running 40 metres without the ball - but four, five, six seconds' effort, he can do that.
"I try to convince them what they have to do. We prefer to have the ball, we believe we can create more chances, but when we don't have the ball we will try to press to win the ball again as soon as possible.
"When I see one player not go to the press, what I feel is they don't want to play. They don't want the ball. They prefer the ball for the opponent. I don't like that.
"I like the ball in our possession and after that try to create as much as possible."