First Minister Mark Drakeford imposed restrictions on sporting events in Wales, effectively meaning professional games are behind closed doors.
There is no date set for when measures could be eased, with the next review scheduled for 7 January.
Wales are due to host Scotland in Cardiff on 12 February.
Wayne Pivac's side are also scheduled to meet France on 11 March and Italy eight days later at the Principality Stadium, meaning Wales could face the prospect of playing over half the competition on home soil with no fans.