Tyson Fury's promoters say they are "baffled" by claims the world heavyweight champion is embroiled in a doping investigation.
A report by the Sunday Mirror alleged traces of a banned substance were discovered in a sample taken last year.
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But Fury's promoter Hennessy Sports has denied the allegations.
A statement read: " We are baffled by today's story in the Sunday Mirror. Tyson Fury absolutely denies any allegation of doping. He looks forward to recovering from his injury and defending his titles against Wladimir Klitschko in October."