Hakim Ziyech insists Chelsea have not yet seen the best of him.
The Morocco international scored the decisive goal in Tuesday's 1-0 win over Malmo, which puts Chelsea close to reaching the Champions League knockout stages.
Asked if the club had seen his best form, Ziyech replied: "No. I know what I can do and where my highest level is.
"I had a tough time with injuries and finding my level again. I have struggled to get into rhythm again but you have to work hard for it."
And when quizzed if the goal was important for him, Ziyech added: "Yeah of course.
"I am trying to be improtant for the team with goals and assists. I have had some hard times behind me, I haven't really recovered fully from it.
"I work every day hard on it. I always believed in myself and things what I can do on the pitch."
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