The European governing body met organisers of the tournament, which has been rescheduled for this summer with the final set to take place at Wembley in London on July 11, in a meeting on Wednesday.
While continuing their commitment to host across the continent despite the pandemic not being under control, Uefa also pushed back until April the deadline for plans to be submitted for the accommodation of fans, two months before the start of the tournament on June 11.
In a statement, Uefa said: "Uefa repeated its commitment to holding the EURO across the 12 cities according to the timetable that has already been published.
"All parties recognise the need for flexibility around decisions to be made on the arrangements for the tournament, in order to reflect the different challenges and circumstances that cities find themselves in. As a result of that and the fast-changing nature of the situation around the pandemic, the deadline for the submission of plans to accommodate fans inside the stadiums has been moved to early April."
Aleksander Ceferin, the Uefa president, said: “Uefa is committed to holding EURO 2020 in the 12 cities originally planned. The EURO is the flagship competition for national team football in Europe and is a vital source of funding for grassroots and wider football development.
“I am optimistic that things are highly likely to be very different with regard to the virus as we move closer to the tournament and it is important that we give the host cities and governments as much time as we can to formulate an accurate picture of what will be possible come June and July.
“Fans are such a big part of what makes football special and that is true of the EURO as much as it is of any game. We must allow ourselves the maximum space to allow their return to the stadiums.”
Wembley Stadium is set to host seven games across the tournament, including both semi-finals and the final.