In practice, the EU's decision could mean France will add the USA to its green travel list, meaning everyone from the United States will be able to enter the country without an essential reason.
Nevertheless, individual member states will have the power to impose the restrictions they deem necessarily, and may ask that travelers present a negative COVID-19 test, or be subject to quarantine before fully entering the country.
Tourists at the Trevi fountain in Rome, Italy.
Unvaccinated travellers from the USA are expected to be allowed to enter the EU from Friday (June 18), under updated recommendations from the European Union.
Several EU countries have already begun using the system, including Belgium, Spain, Germany, Greece, Bulgaria, Croatia, the Czech Republic, Denmark and Poland. The rest are expected to start using it July 1.
It's mainly meant for European Union citizens, but Americans and others can obtain the certificate, too - if they can convince authorities in an European Union country they're entering that they qualify for one.
However, the U.S.'s lack of official vaccination certification system may complicate tourists' abilities to get access to the EU's certificate. But Belgian Prime Minister Alexander De Croo said this week that a careful and phased-in approach should remain the rule.
The EU will also add Albania, Lebanon, North Macedonia, Serbia and Taiwan to the list. "Let's look at the numbers and when it's safe, we will do it", De Croo said.
The recommendations are expected to be formalized Friday. "And I would expect that over the course of this summer".
The news of adding the United States to the list came a day after Brussels and Washington emphasized strengthening relations during a summit that brought together US President Joe Biden, European Commission President Ursula von der Leyen and European Council President Charles Michel.
All travellers entering the European Union from a country on the safe list are in theory allowed to enter for any reason, such as tourism or visiting family, whether they are vaccinated against Covid-19 or not.