West Ham boss Slaven Bilic says his team will hope to capitalise on Manchester City's recent struggles when they clash in the headline fixture of the third round of the English FA Cup on Friday night.
The Hammers will hope to bounce back from Monday's 2-0 Premier League home defeat against Manchester United where they had to play most part of the game with 10 men following Sofiane Feghouli's sending off.
City secured a hard-fought 2-1 home win against Burnley with 10 men after losing 1-0 to Liverpool last Saturday.
Bilic said at Thursday's press conference: "Manchester City had a brilliant start to the season but they have slowed down a little bit. It is a big game for both clubs and the fans."
Bilic expressed delight that Feghouli's red card was overturned by the English Football Association on Wednesday.
"We are happy Sofiane is able to play," he added. "There will be some changes to the team but we will put out a very strong side. We have big ambitions to do well in the tournament."
On improving his squad in the January transfer window, Bilic said: "We have a couple of positions I have discussed with the chairman but I believe in the squad and they have enough strength and character."
"There have been a lot of reports in the media about new signings but I am not going to talk about individual names.
"We wanted Simone Zaza to join the club but his story with West Ham has finished because of the situation with his contract."