French rugby clubs are being urged by the government to postpone matches against British sides to lower the risk of being infected by a more contagious variant of the coronavirus.
The move casts doubt on the ongoing European Champions Cup and second-tier Challenge Cup, and the Six Nations starting in February.
The variant has put unprecedented strain on Britain's hospitals and forced a third national lockdown.
After European Challenge Cup matches in Britain at the end of December, several players in French teams Bayonne and Pau tested positive.
"The sports ministry is writing this weekend to the National Rugby League (LNR) to ask it to postpone the next matches involving French clubs, in accordance with the wishes expressed by several professional French rugby clubs over the last few days," the health ministry said in a statement on Saturday.