Games behind closed doors also an option
UEFA would be ready to move Euro 2016 games to different venues in France and stage matches behind closed doors in response to terror attacks or threats.
Contingency plans have been devised after suicide bombers struck outside of Paris' Stade de France during the French national team's friendly with Germany in November.
UEFA says it is not "aware about any specific threat".
The organisation's tournament director Martin Kallen told Sports Bild that in the event a game has to be cancelled or postponed because of a terrorist threat, "We move the game at the latest on the next day. Ideally, it will take place before the scheduled game on that day. The question would then be, whether it would go ahead with or without spectators."
Tomorrow marks 100 days until the opening game, and a state of emergency remains in place in the country.