The undefeated Russian defeated Gaethje in the second round of Saturday night's main event in Abu Dhabi, clinching victory with a triangle choke from a full mount in the second round.
He then decided to announce his retirement from the sport; a huge shock to fans watching around the world.
Speaking to Jon Anik inside the Octagon, he said: "Today I want to say this is my last fight.
"No way am I coming here without my father. When UFC comes to me about Justin [Gaethje] I spoke with my mother for three days."
White said the UFC lightweight champion fought with two broken toes and a broken bone in his foot.
"What this guy has been through, we're all lucky that we got to see him fight tonight." he said. "Apparently, he was in the hospital and he broke his foot three weeks ago.
"So, he has two broken toes and a bone in his foot that's broken. That's what his corner told me."
Khabib has since shared pictures of his broken foot on Instagram; one being an x-ray of a broken toe and another image of his incredibly swollen foot taken on October 8 - just 16 days before retaining his belt.
An X-ray Khabib just posted on IG shows a broken bone in his foot as of October 7th, 17 days before his title defense pic.twitter.com/TFj3i6JWQa- MMA Gone Wild (@mmagonewild) October 27, 2020
Nurmagomedov walks away from the UFC with a perfect record of 29-0, beating the likes of Edson Barboza, Dustin Poirier and Conor McGregor, among others.
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