Real Madrid and Chelsea face the prospect of leaving unvaccinated players at home for the away legs of their upcoming Champions League last-16 matchups due to a law change in France.

France's parliament passed a law Sunday that mandated proof of vaccination or a recent COVID-19 recovery to enter sports venues and other public places in the country. The new ruling is set to come into effect Monday.

Real Madrid travel to Paris Saint-Germain on Feb. 15 for the first leg of their last-16 clash. Chelsea take on Lille in the same round of the competition, with the game in France scheduled for March 16.