The report will address accusations made by Grigory Rodchenkov, the former head of the Moscow Anti-Doping Laboratory before turning whistleblower, who claimed that up to 15 Russian medal winners at Sochi 2014 were implicated in a clandestine operation in which doping samples were switched for clean ones.

Rodchenkov, the subject of a criminal case from Russian Federal investigators, alleged that the state-sponsored scheme involved athletes ingesting a "three-drug cocktail" of banned steroids which were mixed with alcohol.

It also featured as a covert system to replace the urine of affected medal winners with clean samples using soda containers and baby bottles, he claimed.

The report will be published and revealed to the world's media at a press conference at the Sheraton Centre Toronto Hotel, WADA confirmed today.

It will also be made available on WADA's website.

Canada's McLaren was part of the Independent Commission that published damning reports into Russian doping, leading to athletes from the country being banned from participating at Rio 2016 by the International Association of Athletics Federations.

His report could send further shockwaves throughout the sporting world and may lead to calls for a complete ban on Russian competitors at next month's Games.

WADA President Sir Craig Reedie intimated last month that the organisation may push for a blanket suspension on all athletes from the country taking part at Rio 2016.

The Scot described McLaren's investigation as "a “precedent-setting opportunity to demonstrate collective commitment to clean sport” and vowed to respond "firmly and effectively" if the allegations are proven.

He also said he would "regard that as a high-profile moment that we will have to deal with".

McLaren was appointed on May 18 to lead the probe into the remarkable allegations made by Rodchenkov and WADA had promised the results would be made public before Rio 2016.

"On 18 May, Professor McLaren was appointed by the World Anti-Doping Agency (WADA) as the Independent Person to head an investigative team charged with determining the facts with respect to the allegations of manipulation of doping control samples and other allegations made by Dr. Grigory Rodchenkov, the former Director of the WADA-accredited Moscow Laboratory," a statement said. 

"The investigation was launched to establish what actions must be taken in the best interest of clean sport and clean athletes."

WADA themselves released a report in June detailing the state of progress in Russia, which made a mockery of the country's repeated claims to have made significant improvements.

Severe problems were raised with in and out-of-competition testing, with testers facing athletes running away rather than provide samples as well as the presence of intimidating FSB officials and - in one case - an athlete who tried to pay a bribe after a failed attempt at switching urine samples.

Russian Sports Minister Vitaly Mutko made a last-ditch plea for support to WADA last week as he admitted that his country still has drug problems amid an insistence they are doing everything possible to improve their system ahead of the completion of the report.