Anthony Johsua's heavyweight encounter with Dillian Whyte has been cancelled.
Matchroom promoters confirmed that the fight was off as a result of "adverse analytical findings" in a random VADA test for Whyte.
The fight was scheduled for Saturday, 12 August at the O2 Arena in London.
A statement released by Matchroom read: "Today, the Voluntary Anti-Doping Association (VADA) informed Matchroom, the Association of Boxing Commissions and the British Boxing Board of Control that Dillian Whyte had returned adverse analytical findings as part of a random anti-doping protocol.
"In light of this news, the fight will be cancelled, and a full investigation will be conducted."
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