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Abdulmanap Nurmagomedov was hospitalised in May after suffered a stroke caused by coronavirus complications, with the 57-year-old still in a serious condition.
Despite this, nephew Abubakar posted an image of McGregor being choked out by Khabib at UFC 229 in 2018 with the caption 'This is when the coronavirus and you can't breathe.'
It didn't take long for 'The Notorious' to see the post and he unloaded in the comments section.
Per RT.com, the Irishman said: "I figured it was all just a cover up about Abdulmanap.
"A cover up to hide the lack of activity and the pulling out of fights and running away. Good luck but remember - Allah sees all!"
McGregor had previously offered his support to the Nurmagomedov family after the news of Abdulmanap's condition broke.
Khabib's manager Ali Abdelaziz has had his say on McGregor's comment and called him "the lowest scum on this earth."
@TheNotoriousMMA you're the lowest scum on this earth and I really want to spit in your face. Post something on Instagram and deleting in about someone's sick father. You're fake you punk.- Ali Abdelaziz (@AliAbdelaziz00) June 24, 2020
He tweeted: "Praying for the recovery of Abdulmanap Nurmagomedov.
"A man responsible for more world champions, across multiple fighting disciplines, than we even know.
"A true martial genius! Very saddened upon hearing this news tonight.
"Praying for the Nurmagomedov family at this time."
Lightweight champion Khabib recently updated fans on his father's condition and revealed he is now coronavirus free.
"His condition is still serious, he's still in intensive care," the 31-year-old explained on Russian television. "The coronavirus itself is behind him, but the virus has had consequences for his kidneys and his heart.
"As for the virus, there's no need to worry, only about the other consequences."
Khabib is set to return to the octagon in September with UFC 253 a mooted event for his clash with interim lightweight champion Justin Gaethje.
McGregor, meanwhile, announced his retirement from UFC for the third time in four years earlier this month.
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