Six Nations organisers rule out prospect of line-up changes

World champions South Africa have been persistently linked with a move into the Six Nations (David Davies/PA)

Six Nations organisers have sought to end persistent speculation over South Africa joining the Championship by ruling out any changes being made to the existing participants.

Earlier this week the Springboks committed to remaining in the Rugby Championship until at least 2025, only for it to be suggested that they would align themselves with the northern hemisphere thereafter.