Shakhtar Donetsk coach Igor Jovićević has declared Mykhaylo Mudryk a bigger talent than Real Madrid star Vinicius Jr.
Shakhtar sold Mudryk to Chelsea last month.
Jovićević said, "He can go as far as he wants. His ambition is unlimited, he can win the Ballon d'Or.
"He has more offensive skills than Vinicius. I can't compare, because Mudryk has just arrived at the top and Vinicius has been at the top level for several years, but he has enormous potential.
"He has an incredible work ethic: yes he trains when everyone is resting. He always wants to perfect his shot and says he wants to be the best in the world. He has a prodigious winning mentality."