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.
Defensive errors certainly cost them against Villa and Toure accepts it is a concern, and he said: "It was a disappointing night. The team didn't play well. We conceded four goals, which is not good, and we gave some cheap goals to Villa as well. It concerns us because a team like Man City cannot expect to concede four goals at home."
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