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.
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