The British and Irish Lions' tour of South Africa could be postponed if restrictions in place because of the coronavirus pandemic mean international fans cannot attend, says South African Rugby chief executive Jurie Roux.

But Roux said it is not "commercially viable" if supporters cannot travel.

"There has been some talk of moving it out [to a new date]," Roux said.

"But our travel advice is that by June/July we should be at what is deemed to be normal international travel. But we are monitoring it on a monthly basis."

He added: "Travelling for international events will likely still be under more pressure than pre-Covid [in July 2021].

"No spectators and people not being able to travel would not make this commercially viable and then we would discuss how we continue with the tour."

Registration for the ticket ballot begins on 2 September, with Roux saying "the bulk of the tickets" will be for South Africa fans.

He added that full refunds for tickets and package tours would be offered if the tour is cancelled.

Full 2021 tour schedule:

Saturday 3 July: Lions v Stormers - Cape Town Stadium, Cape Town

Wednesday 7 July: Lions v South Africa 'Invitational' - Nelson Mandela Bay Stadium, Port Elizabeth

Saturday 10 July: Lions v Sharks - Jonsson Kings Park, Durban

Wednesday 14 July: Lions v South Africa 'A' Team - Mbombela Stadium, Nelspruit

Saturday 17 July: Lions v Bulls - Loftus Versfeld, Pretoria

Saturday 24 July (first Test): Springboks v Lions - FNB Stadium, Johannesburg

Saturday 31 July (second Test): Springboks v Lions - Cape Town Stadium, Cape Town

Saturday 7 August (third Test): Springboks v Lions - Emirates Airline Park, Johannesburg