The major change, however, is that the final four places will be decided via play-offs between the winners of the 16 Nations League groups in 2018. Division "B" will be divided into four groups of three teams.
"The Nations League" sees the 55 European national teams placed into four pots with their position depending on their rankings.
There will still be dates in the calendar for the top nations to play worldwide friendlies, with Nations League games taking up four of the six available global match dates at the end of next year.
The four group winners of League A will qualify for the UEFA Nations League Finals, to be held in June 2019, with two semi-finals, a third-place match and the final.
The competition which will effectively replace friendlies will run from September to November 2018.
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Europe's "big" teams like Germany, France, Spain, Italy, England and Holland should enjoy the format, as it allows them to play other "big" teams with a competitive edge before getting into qualifying proper. A host country will be appointed in December 2018 from the finalist teams. The four group winners are promoted to League A, while those who finish bottom will be relegated to League C. The draw for the groups will be in January 2018.
The top four-ranked League B teams that do not qualify for Euro 2020 will enter play-offs in March 2020, with one finals place on offer.
Promotion and relegation will come into play for the second edition of the Nations League starting in 2020.
Despite not qualifying for the World Cup either, the Netherlands will take their place in the 12-team "A" league at the expense of Chris Coleman's side.
Teams will be drawn into four groups of four.
The Euro 2020 qualification play-offs are set for March 2020 as mentioned above, and Euro 2020 itself, which will be played across the continent, will begin three months later.