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Khalil Rountree Jr has faced criticism from other UFC stars for his devastating 'career ending' kick.
The American MMA star, 31, defeated Modestas Bukauskas, 27, with a brutal shot to the knee, bending it the wrong way in an awful visual.
The commentators and spectators were in shock after witnessing the move at UFC Vegas 36 on Saturday night.
The Lithuanian was left in excruciating pain and is awaiting the results of an MRI scan to determine the extent of his injuries.
In the wake of the fight, UFC competitors have questioned whether the move should be made illegal.
Middleweight star Kevin Gastelum tweeted: "This strike should be illegal. It is a career ender. Who can we talk to about this? @ufc.