West Ham manager Slaven Bilic has said he believes his side can shock Manchester City on Saturday.
Away wins at Liverpool and Arsenal have helped the Hammers climb to fifth in the Premier League table -- but City, yet to drop a point, pose their sternest away test yet at the Etihad Stadium.
Manuel Pellegrini's side lost to Juventus in the Champions League on Tuesday but have made a perfect start in the top flight, winning all five of their games without conceding a goal.
Bilic said: "It would be a surprise, of course, because before Juventus Man City scored 11 goals and didn't concede -- they are cruising.
"They already have a gap [at the top of the table] which is hard to catch after five games.
"So on the one hand it would be a surprise, but to be fair it would not be a shock considering we have done it two out of two already.
"It's good for us -- we know what we have to do to have a chance. They are the favourites but I am expecting us to have a good game, and if we have a good game we have a chance.''
Bilic said City boasted "extreme" quality after the summer spending spree that followed the disappointing defence of their title last season.
"At the start of preseason, the players and manager probably said: 'Come on, guys, let's do it, last year was not good.'
"The quality is there. It's extreme. It's scary quality.''
West Ham have unearthed their own star in Dimitri Payet, who has made a superb start to life in England since signing from Marseille in June.
Payet's two goals against Newcastle on Monday took his tally to three in five games this season and Bilic said: "I am not comparing him to [Lionel] Messi or [Cristiano] Ronaldo or [David] Silva, but for years managers try to block or stop those big players but they cannot do it.
"That's why they are great players. To add to that Dimitri is playing in a position you have to close down, no matter who plays there.
"He will continue to play like this, especially if the team plays for him and we are helping him."