Defender Kolo Toure admits Manchester City have to find an answer to their defensive problems if they want to remain in the hunt for trophies.
A much-changed team slipped to a surprise 4-2 defeat at home to Aston Villa in the third round of the Capital One Cup having twice taken the lead. Roberto Mancini's side have conceded 14 goals in seven matches - 16 in eight matches if the Community Shield is counted - and have yet to keep a clean sheet.
