The play-offs will determine the final four places at UEFA EURO 2020; here's how they look right now.
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The 16 UEFA Nations League group winners are all guaranteed at least a UEFA EURO 2020 play-off place, with each League assured of its own play-off path.
All 55 member associations – including those 16 group winners – have the chance to qualify directly for UEFA EURO 2020. The EURO qualifying draw (Sunday 2 December) will form the ten groups, with the top two in each advancing directly to the tournament.
That leaves four EURO places to be determined via the play-offs. In theory, the four group winners will contest each League's own play-offs.
UEFA Nations League group winners
League A: England, Netherlands, Portugal, Switzerland
League B: Bosnia and Herzegovina, Denmark, Sweden, Ukraine
League C: Finland, Norway, Scotland, Serbia
League D: Belarus, FYR Macedonia, Georgia, Kosovo
However, these play-offs do not take place until March 2020 – AFTER the conclusion of the conventional European Qualifiers. The EURO play-off berths of any UEFA Nations League group winners who qualify via the European Qualifiers will go to the next best-ranked team in their League.
If a League does not have four teams to compete (say, for example, if ten of the 12 League A teams qualify automatically), the remaining slots are allocated to sides from another League in accordance with the overall UEFA Nations League rankings.
However, group winners cannot be placed in a play-off group with teams from a higher League. Therefore, should a play-off group including at least one group winner not have enough teams from the same League, the remaining spot(s) will have to be filled by teams from a lower League.
02/12/2018: European Qualifiers group stage draw, Dublin
21/03/2019: European Qualifiers begin
22/11/2019: European Qualifiers play-off draw
01/12/2019: UEFA EURO 2020 final tournament draw
26/03/2020: European Qualifiers play-offs begin
01/04/2020: Additional final tournament draw if required
12/06/2020: Opening game, Stadio Olimpico (Rome)
12/07/2020: Final, Wembley Stadium (London)
How will the play-offs work?
The highest-ranked team in each League will play the country ranked fourth, with the nations placed second and third comprising the other semi-final.
Unlike previous play-offs, these will be single-leg knockout matches, with the highest-ranked teams hosting each semi-final. The host for each League's play-off final will then be drawn in advance.
How do the Finals fit in?
The Finals, which take place in Portugal in June 2019, are a separate entity and do not double up as League A's play-off. The winners do not qualify automatically for UEFA EURO 2020.