'You truly are the G.O.A.T': Ronaldo, McGregor, Pacquiao and White among stars to congratulate Khabib Nurmagomedov on his retirement

Russian called time on his career following his victory over Justin Gaethje at UFC 254 in Abu Dhabi

Cristiano Ronaldo, Conor McGregor and Manny Pacquiao were among those to pay tribute to Khabib Nurmagomedov following his decision to retire from the UFC on Sunday in Abu Dhabi.

The lightweight champion, 32, made the shock announcement immediately after his second-round victory against Justin Gaethje in the headline bout at UFC 254 at Flash Forum. The win, secured via a triangle choke, ensured Nurmagomedov walked away from the sport unbeaten, with a professional mixed martial arts record of 29-0. It was his third title defence.

After defeating interim-champion Gaethje, a tearful Nurmagomedov said he had vowed to his mother to keep his word to retire. His father, and longtime coach, Abdulmanap Nurmagomedov, died in July from heart complications made worse by contracting Covid-19.

Ronaldo was one of the first to react to Nurmagomedov’s retirement, posting on Instagram: “Congrats bro, your father is proud!”

McGregor, whom Nurmagomedov defeated in their infamous bout in 2018 - the most lucrative fight in UFC history - took to Twitter to say: “Good performance @TeamKhabib. I will carry on. Respect and condolences on your father again also. To you and family. Yours sincerely, The McGregors.”

Former light heavyweight champion Jon Jones, considered by many the UFC’s greatest of all time, said also on social media: "I want to congratulate Khabib for an outstanding career. I know he made his father along with millions of fans around the world incredibly proud today. May God continue to bless him on his journey."

Meanwhile, eight-division boxing champion Pacquiao posted on Twitter: “Congrats to the [greatest of all time] @TeamKhabib on a great win and a great career! It was a privilege to watch you compete. Respect!”

Many said the victory against Gaethje lifted Nurmagomedov to become the greatest athlete in UFC history, with Dana White, the promotion’s president tweeting later on Sunday: "Congrats @TeamKhabib you accomplished EVERYTHING you set out to do. You are the [pound-for-pound] best fighter in the world and you truly are the G.O.A.T of the sport."

UFC 254 brought down the curtain on "Return to Fight Island", the promotion's five-event residency in Abu Dhabi and its second series in all in the capital.

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UFC 254: Khabib beats Gaethje in Abu Dhabi

UFC 254 GALLERY: Dagestan fighter Khabib Nurmagomedov celebrates his victory over Justin Gaethje of the US after their lightweight title bout on UFC Fight Island in Abu Dhabi. Getty

Khabib Nurmagomedov celebrates his victory over Justin Gaethje. Getty

Khabib Nurmagomedov clinches his victory over Justin Gaethje via a second-round triangle choke at Flash Forum. Getty

Khabib Nurmagomedov takes down Justin Gaethje. Getty

Justin Gaethje kicks Khabib Nurmagomedov. Getty

Khabib Nurmagomedov punches Justin Gaethje. Getty

Khabib Nurmagomedov after his victory. Getty

Australian fighter Robert Whittaker lands a punch during his victory over Jared Cannonier of the US in their middleweight bout. Getty

Robert Whittaker after the fight against Jared Cannonier. Getty

Jared Cannonier punches Robert Whittaker. Getty

Robert Whittaker punches Jared Cannonier. Getty

Dagestan's Magomed Ankalaev celebrates his KO victory over Ion Cutelaba of Moldova in their light heavyweight bout on UFC's Fight Island, in Abu Dhabi. Getty

Magomed Ankalaev knocks down Ion Cutelaba. Getty

Magomed Ankalaev punches Ion Cutelaba. Getty

Russian fighter Alexander Volkov celebrates his victory over Walt Harris of the US after their heavyweight bout. Getty

Alexander Volkov punches Walt Harris. Getty

Walt Harris punches Alexander Volkov. Getty

US fighter Lauren Murphy celebrates her victory over Liliya Shakirova of Uzbekistan after their women's flyweight bout. Getty

Lauren Murphy punches Liliya Shakirova. Getty

Liliya Shakirova and Lauren Murphy during their bout. Getty

US fighter Phillip Hawes lands a punch during his 18-second victory over Jacob Malkoun of Australia in their middleweight bout. Getty

Phillip Hawes punches Jacob Malkoun. Getty

Phillip Hawes celebrates his KO victory over Jacob Malkoun. Getty

Phillip Hawes celebrates his KO victory over Jacob Malkoun. Getty

Kazakhstan's Shavkat Rakhmonov on his way to victory over Alex Oliveira of Brazil in their welterweight bout. Getty

Alex Oliveira lands a kick on Shavkat Rakhmonov. Getty

American fighter Casey Kenney lands a punch and his way to victory over Nathaniel Wood of England in their catchweight bout. Getty

Nathaniel Wood punches Casey Kenney. Getty

Australian Tai Tuivasa lands a punch on Stefan Struve of the Netherlands on his way to victory in their heavyweight bout. Getty

Stefan Struve lands a kick on Tai Tuivasa. Getty