That means Wales fans probably won’t be able to visit Baku, Azerbaijan, or Rome, Italy, to see their team play.
England, however, will play all three of their group games at Wembley.
At least 10,000 fans will be permitted to attend the matches. That number might increase if test events for matches prove successful.
UEFA is hopeful that Wembley will be at least half-full for the semi-finals of Euro 2020, as well as the final.