Toni Rudiger has no doubt Champions League winners Chelsea have improved thanks to Romelu Lukaku's addition.
The defender admits there's belief among the dressing room that if good chances can be created then the goals and wins will inevitably follow.
"He is a striker of great class so it's good to have him around," Rudiger told the club's website. "He has a big personality but for us what is more important is the team and not only the one player.
"Last season we also had a lot of chances but it is just that we didn't finish so well but having him, and Timo Werner as well, with their qualities, is very good.
"Obviously he is important for us scoring goals and of course to have a great player like him is very good but the reason why we won the Champions League last year is we did it as a team."
He added: "Obviously last year we won the Champions League but now we start again from zero. We know the expectations so we have to be mentally ready each game.
"We are very clear with ourselves about that so mentally it should not distract us in any way."
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