McGregor quickly deleted several posts he made about the Nurmagomedov familyCredit: Getty

The California State Athletic Commission issued the undefeated fighter with a six-month ban and $50,000 fine because he tested positive for an undisclosed banned substance just days before his Bellator 300 main event on October 6.

“I am not one bit surprised upon hearing another of the Nurmagomedov team testing positive for steroids. Hypocrites of the highest order,” McGregor tweeted in response to Usman’s drug test result.

‘Notorious’ went a step further in a follow-up post as he brought up Nurmagomedov’s – who is a devout Muslim – faith and made an out-of-line comment about his late father.

“He added: “Steroids are HARAM!

“The shame of Allah hangs over the Nurmagomedov clan.”

“Cheaters! Abdulmanap is doing tumbles in his grave.”

The 29-0 retired UFC star is yet to comment on his cousin failing a drug test or that face McGregor has attempted to use it as a stick to beat his family with.

However, Usman recently took to social media to insist he’s not a drug cheat and attempt to explain away his failed test as a lapse in judgement.

Usman Nurmagomedov will not be stripped of his Bellator beltCredit: Bellator

McGregor is disgusted but not surprised by a member of the Nurmagomedov’s failing a drug testCredit: Getty

“I would like to give a comment regarding the latest news on my suspension,” the 25-year-old wrote in a post to his Instagram followers.

The results of my test revealed a prohibited substance that entered my body through medications, prescribed to me by a doctor.

“A few months before my fight, I was undergoing treatment, but unfortunately, I did not notify the Athletic Commission in advance.

“I would like to note that the California State Athletic Commission conducted its own full investigation, where I provided all the necessary documents, doctor notes, and medical certificates, thanks to which the period of my disqualification was reduced to 6 months, instead of longer suspensions accepted in such cases.