“They are trying to recover from the kicks they had in the last game. We will see tomorrow, we have some doubts,” he said.
“It was not a good start to the season, we made too many mistakes and we need to improve to be a competitive team,” he added.
“We must be consistent in our style. All the preparation, or the most part of it, is in the way we can improve our style of playing.
“One defeat will not change our mindset. We have built a good squad. We must try to play better, we must defend better but it is just one game.”
Midfielder Jack Wilshere has trained all week despite coming off with a dead leg against City.
Skipper Mark Noble remains sidelined by a calf injury but is expected to return to training next week.
The West Ham manager also spoke of his unwillingness to let Super Cup hero Adrian leave the club.