Sam Allardyce is hoping West Ham will find a way of ending Manchester City's unbeaten start to the Premier League season, and believes that the reigning champions are not as solid in defence as they used to be.
City have conceded nine times in nine games, having let in just 29 in all of last season.
The Citizens have also shipped seven goals in three Champions League ties so far and Allardyce said: "There have been a few changes and a few players he (Roberto Mancini) has lost through injury and that disrupts what was his renowned back four from last season.
"He has tried a different style, a different system, he has lost Nigel de Jong who used to give them that protection.
"It is a bit more encouraging. I watched Swansea last week and they were very impressive against them but at the end of the day they still didn't get anything out of the game.
"It is no good saying 'what a good performance' if you have lost, so you have to get a result if you have given a good performance and that is what we are looking for."
As for facing City, Allardyce added: "They have a lot of talented players and that is one of the key reasons you have to focus on trying to nullify that talent if you can and then maximise your possession.
"If you're going to be limited in possession against the big boys you have got to make sure you have got the quality to maximise that and try and expose one or two of their weaknesses."
West Ham face all of last season's top five in their next 10 league fixtures and, while Allardyce is expecting a tough test, he has been buoyed by the performance in the 3-1 defeat to Arsenal last month.
"We were very close to getting a result against Arsenal," he said.
"It was only because we missed some crucial chances before Arsenal scored the second and the third late on in the game that we didn't get a result."