Manchester City's Manuel Pellegrini 'worried' by lack of goals

Manchester City manager Manuel Pellegrini says he is "worried" about his side's recent lack of goals, and it is "difficult to understand".

City were knocked out of the FA Cup by Wigan on Sunday, and exited the Champions League after a two-leg defeat by Barcelona on Wednesday.

They currently lie nine points behind Premier League leaders Chelsea, but have three games in hand.