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World heavyweight champion Tyson Fury has announced his retirement from boxing.

The controversial boxer, who recently pulled out of his rematch with Wladimir Klitschko due to mental health issues, labeled the industry "the saddest thing I ever took part in" and "a pile of s***".

He tweeted: "Boxing is the saddest thing I ever took part in, all a pile of s***, I'm the greatest, and I'm also retired, so go suck a d***, happy days."

On Thursday, Fury was found to have traces of cocaine in a test carried out 24 hours before he withdrew from his re-arranged rematch with Klitschko.

The test was carried out by the Voluntary Anti-Doping Association (VADA) as requested by Klitschko in the build-up to their postponed October 29 clash at Manchester Arena.

(Image: CHRIS NEILL/MAVERICK PHOTOGRAPHY)

Fury, 28, already faced being stripped of his WBA Super and WBO crowns by the two governing bodies because of his second postponement and his failed drugs test compounds his problems.

And now, faced with lengthy bans and the stripping of his titles, Fury has announced his retirement.

(Image: CHRIS NEILL/MAVERICK PHOTOGRAPHY) (Image: Reuters)

Fury was due to appear before UK Anti-Doping on November 4 to answer charges that he failed a drugs test for nandrolone last year before he dethroned Klitschko in Dusseldorf to become world heavyweight champion.

His appearance at that meeting is now in doubt.