A second Six Nations championship could be played in October and November this year.
According to The Rugby Paper, home union bosses are drawing up plans for an emergency tournament, which would replace southern-hemisphere teams' tours of Europe should they be cancelled due to the coronavirus pandemic.
The Springboks are due to face Italy (7 November), Ireland (14 November), France (21 November) and Wales (28 November) on their year-end European tour.
The report in the UK-based rugby publication added that the fixtures and venues for the second Six Nations of 2020 would be the same as for the first, which had four matches postponed.
Those would need to have been played by the end of September in order for the second Six Nations tournament to start in October. It would be played over an eight-week block.
England were leading the Six Nations standings when the tournament was halted, narrowly ahead of France on points difference.