World heavyweight champion boxer Tyson Fury has said he has retired from the sport.
The boxer, who holds both the WBA and WBO titles, made the announcement in an expletive laden message on his Twitter account.
He said: "Boxing is the saddest thing I ever took part in, all a pile of s***. I'm the greatest & I'm also retired, so go suck a d***, happy days."
It comes after he tested positive for cocaine as he failed a urine test on September 22, the day before he pulled out of a title rematch with Wladimir Klitschko, citing mental health issues.
The test was carried out by the Voluntary Anti-Doping Association (VADA).
However, it was not known if the fighter would be banned or lose his world titles as a result of failing the drugs test.
According to The Guardian, under World Anti-Doping Agency rules cocaine is not prohibited when it is taken out of competition.
Fury also has a UK Anti-Doping investigation hanging over him after a sample tested positive for the anabolic steroid nandrolone last year.
Neither Fury nor the British Boxing Board of Control made any comment on the matter.