The Blues marched to the Premier League title last season but have endured an inconsistent start to the campaign, with losses against Burnley, Manchester City and Crystal Palace leaving them nine points behind leaders Manchester City.
Moses, who is currently out of action with a hamstring injury, told Goal.com: "I think we have done well [in my absence]. We as a team, whatever happens, we stick together as a team and do the best we can.
"I think people have been a bit too harsh but we as players don't need to think about that or concentrate on what people have been saying after losing against Roma [3-0 in the Champions League].
"We believe in ourselves collectively and individually, we have great players. We just take each game as it comes. We beat Manchester United, now everyone is saying that we're the best, football is like this. We believe in ourselves and work hard together as a team."
Up next for Chelsea is a Premier League trip to West Bromwich Albion on Saturday.