Khabib Nurmagomedov has been trained by his father Abdulmanap Nurmagomedov throughout his MMA career and Abdulmanap has also been a front figure for the Dagestan region which has been successful in MMA.
It was Chechen leader Ramzan Kadyrov who announced the news of the coach's death.
Swedish MMA fighter Ilir Latifi also mourns Nurmagomedov.
“I had the honor of meeting this amazing man and legend when I was in Russia a couple of years ago. A big man with a great following, ”he writes on Instagram.
MMA more: Nunes took historic victory (June 7):
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Amanda Nunes defended her UFC belt in featherweight tonight. Photo: John Lochner / AP / TT