The semi-final pairings, along with the administrative home teams for the third place play-off and final, were determined by means of an open draw on 3 December 2018.

[7] Host country Portugal was selected among the four qualified teams on 3 December 2018 by the UEFA Executive Committee,[8][9] with the winners of the final crowned as the Nations League champions.

The main qualifying process began in March 2019 instead of immediately in September 2018 following the 2018 FIFA World Cup and ended in November 2019.

[6] The qualifiers were played on double matchdays in March, June, September, October, and November 2019.

Unlike previous editions, the participants of the play-offs were not decided based on results from the qualifying group stage.

[15] The draw for the league phase took place at the SwissTech Convention Center in Lausanne, Switzerland on 24 January 2018, 12:00 CET.

Due to winter venue restrictions, a group could contain a maximum of two of the following teams: Norway, Finland, Estonia, Lithuania.

The semi-finals pairings were determined by means of an open draw, along with the administrative home teams for the third place play-off and final.

The draw took place on 3 December 2018, 14:30 CET (13:30 local time), at the Shelbourne Hotel in Dublin, Republic of Ireland.

The overall ranking after the league phase was used for seeding in the UEFA Euro 2020 qualifying group stage draw.

[27] However, in October 2018, the solidarity fees and bonus payments for group winners were increased by 50%, while the bonuses for the teams appearing in the Nations League Finals also increased, resulting in a total of €112.875 million in prize money.