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Yes, Chelsea doesn't seem to be too bothered by the problems that befell Mudryk, especially since his contribution to The Blues is still lacking, his performance does not reflect his price, so losing him will not affect Chelsea's current performance at all.
However, if Palmer is in that situation, it will indeed be a big loss for Chelsea because he currently plays a big role in every victory achieved by Chelsea.
It seems that if Mudryk really uses doping, we will see another Pogba.
If the Ukrainian player did not use it on purpose, the rate of this will probably be clear in the analysis. However, if he used it on purpose, then we may see a new Pogba case. He may not play football for a long time and this kid is only 23 years old. It is an important age for football and facing such a problem early on could affect his fate. Moreover, he plays for a team like Chelsea and has the opportunity to improve himself. I hope he did not do this on purpose.
Well, since the last time whenever he played the match. His contribution level regarding through the club is nil. I mean, Mudryk didn't fulfill the purpose of the Chelsea team like for what they hired him for. Chelsea have Cole Palmer, whose contributions are unimaginable. So I think Chelsea won't have any concern piece. In the absence of Mudryk, there are many other players who can contribute much better than him. To be honest, Mudryk's career may be stuck in a difficult situation just like Pogba was. Because, as you described, he is 23 years old, and still he is affiliating with such kinds of illegal activities. So his involvement in similar issues at such a young age can ruin his career.