CONOR McGREGOR appeared to spit in a fan's face after a jibe about Khabib Nurmagomedov.
McGregor, 36, hasn't stepped inside the octagon since suffering a horrifying leg break during his trilogy defeat with Dustin Poirier at UFC 264 four years ago.
The Irish fighter's return date is still unknown after his highly-anticipated comeback fight against Michael Chandler was axed due to a toe injury.
The mixed martial artist, though, is still attracting the spotlight as a shocking clip of him has now gone viral.
McGregor is shown strolling through a shopping centre as a fan is heard yelling "Let's go Khabib", in what appears to be a quip directed at the Irishman.
The former lightweight champion turns around and has an angry confrontation with the man in question.
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An apparent spitting sound is then heard before the ex-featherweight champion walks away.
McGregor is heard saying: "I spit in your face, what do you do? Nothing."
The location and date in which the clip is recorded is not known.
McGregor and Nurmagomedov, both 36, took part in the biggest fight in UFC history in October 2018.
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Then lightweight champion Nurmagomedov emerged victorious from the UFC 229 grudge match, submitting McGregor via a fourth-round neck crank.
The two fighters had fiery confrontations both inside and outside the octagon.
Just last week UFC fans were left stunned when McGregor launched a shocking social media rant aimed at Nurmagomedov - including a racial slur.
Last month a jury found in a civil case last November that McGregor had sexually assaulted Nikita Hand - who accused him of rape in a Dublin hotel in 2018.
Judge Mr Justice Owens said a jury had determined that McGregor assaulted Ms Hand on 9 December 2018 in the Beacon Hotel in Dublin.
She was awarded €250,000 (£210,000) in damages.