The British and Irish Lions series with South Africa could be held in the UK if Covid-19 prevents fans from travelling.
Reversing the venue is among the contingency plans discussed by the Lions board in the event that the trip has to be abandoned.
Instead, tour games would be played in Edinburgh, London, Cardiff and Dublin.
The Lions board have previously made it clear the tour can’t proceed without fans, with 30,000 believed to be planning to travel to South Africa.
However, it is hoped that a vaccine would allow for fans to attend games in the UK by summer.
In a statement on Saturday the Lions board announced that they’d been having “repeated meetings to discuss all scenarios available and is in constant dialogue”.
Under the plan, the test matches with world champions South Africa would likely be held at the Principality Stadium, Wembley and Twickenham. A warm-up contest with Japan is already scheduled for Murrayfield on 26 June.
After that, the Lions are due to travel to South Africa to play five provincial games before the three-Test series against the Springboks.
Government restrictions currently forbid fans from attending, but even if restrictions are lifted, the Lions board are worried that such a large movement of people could put any Covid-19 recovery in jeopardy.
It had been mooted that the tour might be delayed until 2022, but all four nations have Test matches scheduled for that summer window and are not keen on that switch.
Lions managing director Ben Calveley said: “It will meet throughout January and into February, if required, to review all relevant information and data.
“After further consultation with SA Rugby, we will update on the outcome of these meetings in due course.”