The Ukraine winger has been linked with a summer move away.
But he told Sky Sports: "I don't reach my full potential because of some of the reasons. I need some time and (there is) a lot of stuff to improve.
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"We will see in the future, my potential will increase. I am doing good, but I can be better.
"Everything is good, London is a nice city and Chelsea are a big club. Thank you to all my teammates and the people around me they help me a lot to (help me) feel myself in good conditions."