Mancini says Manchester City must improve to stay top of the league

Manchester City manager Roberto Mancini says his side "need to improve" if they are to stay top of the Premier League.

Speaking ahead of their Champions League clash with Villarreal, Mancini says the club are in their "best moment... in the last 20 years", but insists his squad must "continue to work hard".

Mancini is expecting a "very difficult" match at the Estadio El Madrigal, despite The Yellow Submarine having lost all three of their games in Group A so far, including a 2-1 defeat to City last time out.