The International Olympic Committee (IOC) will decide on Tuesday whether to provisionally ban Russia from the Rio Olympics, which start on 5 August.
IOC president Thomas Bach will host a telephone conference call to decide on "provisional measures and sanctions".
McLaren said he had "only skimmed the surface" in his 57-day investigation, and Wada wants the Canadian to "complete his mandate" by identifying athletes who benefited from the programme.
The IOC should "decline entries, for Rio 2016, of all athletes" submitted by the Russian Olympic Committee and the Russian Paralympic Committee, says Wada.
Its president, Sir Craig Reedie, described the "scope and scale" of the findings as a "real horror story".