France and Switzerland will play their Euro 2020 last-16 clash in front of up to 25,000 people at the National Arena in Bucharest, UEFA announced Saturday, doubling the previously announced attendance.

"We can confirm that the National Arena Bucharest capacity was increased to around 50 percent. The available capacity will be approximately 25,000," UEFA confirmed in a statement to AFP ahead of Monday's match.

European football's governing body added that the additional seats made available were sold "only to fully vaccinated people".

The permitted crowd at the stadium in the Romanian capital for the tournament had previously been set at 25 percent of the venue's capacity.