Joshua came out second best in the IBF World Heavyweight title fight throughout and was finally knocked out in the fifth round after Dubois landed a right to the chin. This came after the former heavyweight champion had been floored several times before the final blow.
At 34, Joshua is nearing the end of his career, and some have suggested he bow out for good instead of chasing another big payday.
McGuigan, a veteran of the sport, tweeted his congratulations to both fighters but also suggested that Joshua consider retirement for the sake of his health.
"What a fabulous World Heavyweight Title Fight," said the Clones legend on X.
"Congratulations to both Daniel Dubois and Anthony Joshua for their heart, courage, and commitment to produce a great spectacle. Big boost for boxing. Time to consider your health, Anthony."
Joshua was also asked about his thoughts on retirement after the loss and admitted that he still wanted to continue boxing at the highest level.
“Always walk with your head high. We rolled the dice for the third time, 13 world title fights. Not every one has been successful, but they’ve all been fun and entertaining,” Joshua told The Independent when asked about his future.
“You’re probably asking if I still want to fight. Of course, I want to continue fighting. We took a shot at success and came up short. What does that mean now? That we’re going to run away? No, we’ll live to fight another day. And that’s what I am—I'm a warrior."
Joshua also gave credit to Dubois, who retained his IBF heavyweight title at Wembley Stadium in London.
“There were a few mistakes in there, but that’s the name of the game. Fine margins cost you at the top level. Also, before I finish, we have to give credit to our opponent, Daniel. When I sign up to fight opponents, I don’t really like them in my head anymore. But now that it’s done, I take my hat off to him and say, Well done.”
