But Ziyech said: “Eden is a world-class player.
“You always take inspiration from that, how he plays the game. You always look at the small things, how he does stuff - and I can learn a lot from him."
And Ziyech insists that Chelsea's expensively assembled squad are convinced they can be title challengers this season.
He added: “Of course we can make a challenge.
“You always have to believe in it. It starts from believing in it and then working every day harder. At the need of the day we will see what it brings."