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SAINT PETERSBURG, RUSSIA - APRIL 20: (L-R) Alistair Overeem of The Netherlands knees Aleksei Oleinik of Russia in their heavyweight bout during the UFC Fight Night event at Yubileyny Sports Palace on April 20, 2019 in Saint Petersburg, Russia. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)

SAINT PETERSBURG, RUSSIA - APRIL 20:  (L-R) Alistair Overeem of The Netherlands knees Aleksei Oleinik of Russia in their heavyweight bout during the UFC Fight Night event at Yubileyny Sports Palace on April 20, 2019 in Saint Petersburg, Russia. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)