By Miguel Rivera

The World Boxing Council has been notified by VADA [Voluntary Anti-Doping Association] that all of the preliminary tests performed on Gennady Golovkin and Kell Brook have been negative.

Further testing from the random drug testing process may still be pending to be reported. And of course, after the fight, an anti-doping test will be performed.

The WBC established a partnership with VADA to test all of their champions and fighters who are highly ranked in each weight division. Fighters who are involved in WBC sanctioned world title fights will be subject to random drug testing by VADA.

On Friday, the WBC revealed the weights for their mandatory seven day weight check - where Brook still held a weight advantage. Golovkin weighed 162.9, and Brook was 167.8-pounds. At the 30 day weight check, Golovkin was 165-pounds and Brook was 176.

The fight takes place next Saturday night at the O2 Arena in London, where Brook (36-0, 25KOs) - who currently holds the IBF's welterweight world title - will rise up by thirteen pounds to challenge Golovkin (35-0, 32KOs) for the IBF, IBO, WBA and WBC middleweight titles. The event will be carried by HBO and Sky Sports Box Office.

The undercard has been stacked with local talent, prospects and rising contenders.

Callum Smith defends his WBC Silver title against tough Hungarian Norbert Nemesapati while his older brother Paul continues his hunt for a third World title shot, Martin J. Ward and Andy Townend meet for the vacant British Super-Featherweight title, WBC Silver Super-Bantamweight champion McDonnell is tracking down a World title shot of his own Sheffield Super-Bantamweight and Brook’s Ingle Gym mate Galahad continues his comeback, Conor Benn boxes for the fourth time in the paid ranks and unbeaten Middleweight Craig Richards tastes his fifth action in the pros.