The Springboks have not been in action since lifting the World Cup in Japan last year, and face an uncertain schedule in the remainder of 2020 as travel restrictions due to the Covid-19 pandemic limit their ability to tackle multiple tours.
South African Rugby chief executive Jurie Roux said they were hoping to start an eight-team domestic competition in either late August or early September to prepare players for an international window somewhere between October and December.
Roux confirmed that the inbound tours by Scotland and Georgia, that had been scheduled for July, were cancelled and there would be no attempt to play them later in the year.
The Boks were due to travel to Italy, France, Ireland and Wales for their traditional set of November internationals, the latter two fixtures providing vital preparation for a home meeting with the British & Irish Lions in July-August 2021.
But it now appears likely their only tests prior to that lucrative tour, the biggest set of fixtures outside of a World Cup, will be against Southern Hemisphere opposition.