The British and Irish Lions' tour of South Africa will go ahead as planned in July and August 2021.
The Lions play three Test matches against the world champions in Johannesburg, Cape Town and Gauteng.
They play eight matches in total on the tour, including five warm-up games against invitational sides and Super Rugby teams.
The tour will take place at the same time as the rescheduled Tokyo Olympics, which run from 23 July to 8 August.
British and Irish Lions managing director Ben Calveley said: "An enormous amount of planning, especially from a logistical perspective, goes into putting on a Lions series, so it was crucial that a decision was agreed upon in good time."
South Africa Rugby chief executive Jurie Roux added: "The whole of South Africa is looking forward to welcoming the Lions and we continue progressing our plans to provide travelling supporters with a once-in-a-lifetime experience."
The Lions have toured South Africa on 13 previous occasions, with the first Tour taking place in 1891. The Lions have won four Test series and lost eight - including their most recent tour in 2009 - with one drawn.