Tyson Fury has "finally decided to walk away" from boxing after confirming he is staying retired.
The undefeated WBC heavyweight champion, 34, said he was retiring after beating Dillian Whyte in April.
"On my 34th birthday I say bon voyage," Fury tweeted on Friday.
"Massive thanks to everyone who had an input in my career over the years and, after long hard conversations, Ive finally decided to walk away."
In another tweet he added: "See you all on the other side you big dossers 2008-2022."
Since Fury beat Whyte in April, there has been a host of suggestions about what the champion could do next.
Another stint in WWE, an exhibition match against UFC heavyweight champion Francis Ngannou, and a fight against the winner of Joshuas rematch against Oleksandr Usyk have all been mentioned.
Joshua is looking to regain his WBA, WBO, IBF and IBO world titles when he fights Ukraines Usyk in Saudi Arabia on 20 August.
Also on Tuesday, Fury claimed he had hired a new trainer, his long-time friend and fellow fighter Isaac Lowe.
American SugarHill Steward has trained him since 2019, helping Fury overcome Wilder in their trilogy.