How does the tournament work?published at 16:32 Greenwich Mean Time 8 February
The top two teams from each group in League A go into two-legged quarter-finals in March, with the winners going into the final-four tournament in June.
The winner of that will claim the Uefa Nations League trophy.
The winners of each group in Leagues B, C and D are promoted to a higher division. The teams who finish bottom of each group in Leagues A and B are relegated to a lower division.
Teams who finished third in their groups in League A will face League B runners-ups - and League B's third-placed teams will face League C runners-up - in two-legged promotion/relegation play-offs in March.
There will also be play-offs between the two best fourth-placed teams in League C and the two runners-up in League D.
Europe's 2026 World Cup qualifiers start next year. The winners of each of those groups qualify automatically for the North American tournament, with the runners-up of each group entering World Cup play-offs.
The four best Nations League group winners who do not qualify either of those ways will also go into the World Cup play-offs.