Manchester City boss Roberto Mancini insists there's no reason for concern after losing their unbeaten run.

City's defeat at Chelsea has reopened the title race.

"After 15 games we are on the top, with two more points than United," he said. "The season is long. We have said that before.

"We are strong enough to start winning again and one result doesn't change anything. We know if we want to win, we should continue to play well, like we did at Chelsea."

City are the only member of the elite 'top six' who are still to face one of their rivals on home soil.

That changes this weekend against an Arsenal side that has won seven out of their last eight Premier League fixtures after a dismal start to the season.

"We don't have a problem bouncing back," said Mancini. "I am sure we will. We play Arsenal on Sunday. At this moment, Arsenal are playing very well.

"It will be difficult but we need to start again."