He told GIVEMESPORT: "I have spoken to Mudryk many times since this doping issue arose. He doesn't understand how it could have happened. He has no clue. No idea at all. His lawyers organised for him to take a lie detector test, which he passed. It will form part of the evidence showing he didn't intentionally do anything wrong. Mudryk has been clear, it's not his fault that he tested positive. We now need to find out how this has happened, and who did this. His lawyers are trying to find out. There are still no results from the B-sample, so that remains open. Nobody knows what's happened. I wish Mudryk all the best. He's a top professional and a very good person. He should be protected. Shakhtar also has a vested interest. There are bonuses from his move to Chelsea linked to his performances. If he's not playing, it causes problems for us because we could potentially lose €30m. So Shakhtar, Chelsea and Mudryk, we are in one boat. We all support Mudryk, and hope he is allowed to continue playing football soon."