Maicon only joined City from Inter Milan on the last day of the transfer window but has already seen his team lose to Real Madrid in the Champions League and Aston Villa in the Carling Cup while league games at Stoke and at home to Arsenal have ended in draws.
He said: "I know that Roberto is very focused on this. He wants to improve and we have to improve quickly because we can’t afford to have any more distance between us and the teams at the top of the league.
"The manager doesn’t like conceding goals and he’s very passionate about that and he’s already working on that.
"We will do even more work and our focus is on improving that and improving the team’s results as soon as possible."