Slaven Bilic insists West Ham's recent fine form is due to his players' performances, rather than a change in system.
The Hammers had won just once in their opening seven Premier League games of the season until Bilic switched to a three-man defence.
"We are playing good at the moment," he told a news conference ahead of Sunday's trip to Everton. "We have to build on those three wins - they have given us confidence.
"We changed the system a bit, and, OK, it's important - especially when the results come - but it's more about the players' movement.
"Kouyate has helped to stabilise the defence and also helps us to create from the back."
"We have a few knocks and all that [from the Chelsea game], but nothing bad, so all those who played should all be fit and available for Sunday," Bilic added.
"Ayew is very close to being able to start. He had a long break. It's great to have him back. He came on and did really good."
Ayew suffered a thigh injury in West Ham's league clash with Chelsea in the opening round of the campaign, having signed in the off-season from Swansea, where he netted 12 Premier League goals last term.
