Shakhtar Donetsk chief exec Serhiy Palkin says Chelsea are blowing Mykhaylo Mudryk's talent.
The Ukraine has struggled for consistency since Shakhtar sold him to the Blues just over a year ago.
I can tell you that, for me, Mudryk is the most talented and unique player in the world," he told beIN Sports.
I believe that in order to get the maximum from Mudryk, as they anticipate, you need to invest in him. And these investments are not money.
The investment is time with the coaching staff to communicate with him and to work closely with him. Because he is a young boy, he changed from the Ukrainian Championship for the English Premier League.
It's a completely different world, with completely different levels, with football that's completely different. I believe that if the coaching staff dedicates some time to him, he will return three, four or five times more."