Mudryk came off the bench to score in Monday night's victory.
"I felt this unbelievable roar (from the crowd)," the 23-year-old explained. "It was one of my best moments since I've been here at Chelsea.
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"It was like goosebumps, you know."
Mudryk also explained his new celebration which involves him tapping his wrist like he is wearing a watch.
He also told chelseafc.com: "It meant it was God's time. You know, stay calm, don't worry."