The 58-year-old admits his side are encouraged by the indifferent form of Manuel Pellegrini's men on the road, but has rued the lack of defensive options with James Collins injured
The 58-year-old secured a stunning 3-0 victory away to Tottenham prior to the international break, boosting his side’s confidence as they earned their first win since the opening day of the season.
The Hammers take on a City side who have a 100 per cent win rate at the Etihad Stadium, but have yet to record a victory on their travels, and Allardyce is aiming to exploit the visitor's indifferent away form.
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"We have to be encouraged by that. Last year we had a fantastic 0-0 against them. Our top level players have to play at their top level as they did against Tottenham.
"Anything less would make life difficult with the quality of their squad. If our players can exploit their weaknesses like we did against Tottenham I don't think we'll win 3-0 but I hope we do."
While Allardyce was optimistic about his side's chance of surprising City, he was rather more concerned with his weakened defensive options following an injury to James Collins.
"I am concerned about the fact that we only run with three centre-halves," he continued. "So James [Collins] being out is a particular problem for me.
"I have to run with only two central defenders now, James Tomkins and Winston Reid, for however long it takes James to get fit again; that is my big concern."