Aaron Cresswell says David Moyes has instilled a new work ethic into West Ham as he looks to get them out of trouble.
Moyes was appointed new Hammers boss last month, succeeding Slaven Bilic at the London Stadium after a miserable start to the Premier League season.
He has yet to win since being in the hotseat but encouraging performances against Leicester and Manchester City last time out means optimism is growing with the former Everton and Manchester United boss at the helm.
Cresswell says the Scot has injected fresh enthusiasm into the players and made it clear everyone must work harder to get the Hammers moving in the right direction.
"It's been really tough this season and we know it hasn't been good enough from day one, and we know it's only us that can turn it around," the defender said.
"The manager has come in and he’s given us belief and now we just need the points to go with it. We played Man City and we took something from the game. Although we got beat, we dug deep and felt we deserved something out of the game. It wasn't to be, so we've got to take on Chelsea now and get some points.
"The manager has instilled a work ethic. When you're down in the bottom three, you can have the best players in the world, but if you don’t work hard, you certainly won’t win games and he has emphasised that and said 'If you don't run, you won't play' and the lads have listened and it's certainly improved us."
He added on the club's website: "Organisation and running and work ethic are the key to everything and he’s certainly brought that through the door. You’ve got to do the gritty things and you’ve got to do the hard things and we've been out there doing that and working on our shape, our set pieces and how we’re going to take the game to Chelsea.
"We're putting in the work but we haven't picked up the points yet, so that's the next thing we need to work on."