City needed more signings - Mancini

Manchester City boss Roberto Mancini says his side's attempt to defend their Premier League title was undermined by not signing the players they needed after winning the championship last season.

City won the Premier League on the final day of last season, but have been unable to reproduce the form that brought the trophy to the Etihad Stadium, and they go into Monday's derby with Manchester United trailing Sir Alex Ferguson's side by 15 points.

Mancini says his side have not scored enough goals this campaign and that he had the chance to sign "important players who have made a difference in their teams this year".

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