Anthony Joshua Joshua has thanked his fans and said that his'spirit of strength' is strong.
After losing his world titles and losing unanimously to Oleksandr Uzyk, the Brit heavyweight is now in recovery.
Joshua was the favourite going into the fight, as many believed his size and power would prove too much for the former cruiserweight champion.
However, Usyk gave a great boxing show, confusing AJ with his movements and avoiding most of the power shots.
Joshua's hopes of challenging Tyson Fury in a challenge seemed to have been dashed, especially since it was no longer an undisputed clash.
Joshua shared a photo on social media of himself looking steely-eyed. The caption was: "I've seen the fight, analysed and identified my mistakes. I've learnt my lesson.
"Thank you for checking in and sending me love. Do not worry about me. My spirit is strong!"
The Brit was stunned by Usyk before 68,000 spectators at the Tottenham Hotspur Stadium on Saturday.
There was no reason to argue with AJ or most boxers as Usyk gave a masterclass in London boxing.
Joshua instructed Eddie Hearn, his promoter, to arrange a contractual rematch. He was eager for it immediately.
Joshua could be seen wincing in the corner following the 12th round, as he tried to see through his right eye.
Usyk stopped by to congratulate him for a great fight.
Joshua stated, "You want me to go back." You are a fool.
After a brief laugh, the pair moved into the middle of the ring to announce the official result.
Oleksandr Usyk outboxed Anthony Joshua to remove all his heavyweight belts
