The duo were both implicated in what McLaren described as the "disappearing positive methodology" - where positive samples were switched for clean ones.

Frolov, who won the individual title at the 2008 World Championships, was due to be a reserve for the Rio 2016 competition, while Kustov's place has been taken by Ruslan Nakonechnyi of Latvia.

Three other Russians - Aleksandr Lesun, Donata Rimshaite and Gulnaz Gubaydullina - are all eligible based on the International Olympic Committee (IOC) Executive Board's strict criteria, according to the UIPM.

The UIPM Executive Board announced that Frolov and Kustov both tested positive for trenbolone, methenolone and oxandrolone when the samples were analysed in a Moscow laboratory in August 2014 "but the findings were not reported as such".

The IOC, who decided against imposing a blanket ban on Russians at Rio 2016, instead leaving the responsibility to the International Federations (IFs), ruled any competitor implicated in the damning McLaren report would not be eligible for the upcoming Olympics.

The announcement from the UIPM brought the total number of Russians banned from the Games to 85 after seven athletes in swimming, five in canoeing and three in rowing were also excluded, adding to the 68 track and field athletes who failed in their appeal to the Court of Arbitration for Sport (CAS) to get their suspension overturned.

World Sailing have axed one Russian sailor, Pavel Sozykin, from the Games after he was named in the McLaren Report.

Sozykin competes in the 470 class, a two-person boat, and the governing body has agreed that the Russian Olympic Committee will have the opportunity to nominate a late athlete replacement following a conference call of its Board of Directors.

Six other Russian sailors have been cleared to compete.

This number could grow when further IFs make their final decisions, while others who have previously served a drugs ban are also set to miss out due to a guideline set by the IOC.

Elsewhere, the International Shooting Sport Federation (ISSF) have confirmed the 18 qualified Russian athletes in their sport will be able to compete at Rio 2016.

Three samples from Russian shooters were uncovered as part of the McLaren Report, the ISSF revealed, but the organisation said they were "relieved to confirm that these three samples had been correctly entered, at the time they were reported, into the ADAMS database as positives, that all the result management procedures had been followed and that the matters were resolved".

The International Tennis Federation were the first organisation to announce the eligibility of players from the nation, with seven competitors set to take part in Rio.

United World Wrestling, led by IOC member Nenad Lalović, have yet to confirm whether Russians will be cleared to take part in the sport at Rio 2016.

In a statement, the body said it had implemented a number of measures in the wake of the decision of the IOC Executive Board, including commissioning an independent Swedish testing company, International Doping Tests & Management AB (IDTM), to conduct out-of-competition tests in Russia.

They have also clarified "to the IOC that the RUSADA and Moscow labs implicated in the recently published McLaren Report are not part of United World Wrestling’s testing protocol".

"We have requested more information and evidence re: the wrestlers said to be implicated in “disappearing positive tests," the statement added.