Sunderland 1-0 Man City: Lack of goals worries Mancini

Roberto Mancini is "really frustrated" by Manchester City's 1-0 defeat by Sunderland and says his side's lack of goals is a "big problem".

Adam Johnson scored against his former club to condemn City to only their second defeat of the season, but Mancini thinks his side "did not deserve to lose".

City now trail rivals Manchester United by seven points and the Italian admits his side "must change" and start converting their chances into goals if they are to successfully defend their title.