https://www.totalrl.com/new-euro-xii...rts-expansion/
“Application to Euro XIII is open to any domestic club throughout Europe. We already have more than 25 applications from 16 different nations for the 2021 competition and anyone else who wishes to apply still has a short time left to do so. More than one club can apply from a country but the competition will only allow one participant from each nation for 2021."