Conor McGregor has fuelled speculation he is about to retire from the Ultimate Fighting Championship.
The Irishman, 27, sent a tweet in which he said: “I have decided to retire young. Thanks for the cheese. Catch ya’s later.”
Many mixed martial arts fans reacted with shock but others expressed some doubts on social media.
McGregor lost his last fight to Nate Diaz but the pair meet again at UFC 200 in Las Vegas on 9 July.
Up to that point he had been unbeaten since signing to UFC in 2013, with career earnings in excess of $2.8m (£1.94m).
American middleweight Diaz handed McGregor his first defeat in the UFC when he choked the featherweight champion into submission.
McGregor fought Diaz at 170 pounds, 25 more than his usual featherweight limit, at UFC 196.
Diaz responded to McGregor’s comments by tweeting: “I guess my work here is done. I’m retiring too.”