The announcement means no fans from Ireland or the UK permitted to travel.
A revised schedule has been issued, with all matches in Cape Town, Johannesburg, or Pretoria.
The warm-up game against Japan at Murrayfield will still proceed as planned on Saturday 26th June.
Two Irish Lions will go head to head this evening, Tadhg Furlong and Iain Henderson will both start for their respective provinces.
Leinster host Ulster at 8.15 in the Rainbow Cup
Before that, Munster play host to Connacht at Thomond Park from 6.

Kildare Beat The Dubs and into O'Byrne Cup Final
Kildare Senior Hurling Team vs Antrim in Hawkfield
Lunch Sport Updates: Kildare vs Dublin O'Byrne Cup Today
Kildare Senior Football Team Announced For Tomorrow's O'Byrne Cup Semi-Final
Ulster Head Coach Richie Murphy Makes 10 Changes For Their Game With Cheetahs
Connacht Announce Changes For Their Away Game Against Montpellier
Munster Make 10 Changes For Their Trip To Toulon On Sunday
The Leinster Rugby Team To Take On La Rochelle In The Investec Champions Cup Has Been Named