Manchester United boss Sir Alex Ferguson reveals derby concerns

Manchester United manager Sir Alex Ferguson says his side need to improve on their recent defensive form or risk paying the price in Sunday's derby with neighbours Manchester City.
Ferguson's side looked vulnerable as they won 4-3 at Reading on Saturday.
United have conceded 32 goals in all competitions this season, and Ferguson conceded: "It's a worry.
"If we perform like that on Sunday then God knows what's going to happen to us."
United are three points clear at the top of the Premier League, and secured a place in the Champions League knockout stages with two games to spare in Group H.
Their total of 37 Premier League goals is nine higher than any other team in the top flight, but Ferguson is concerned his defence could suffer at the hands of Mario Balotelli and Edin Dzeko at the Etihad Stadium.