UEFA: the Executive Committee sets the format of the Nations League, 16 groups of 3 or 4 teams
The format of the Nations League and European qualifiers for the 2018-2022 cycle were approved at the last meeting in 2014 of the UEFA (Union of European Football Associations) Executive Committee at the House of European Football in Nyon (SUI) on 04/12/2014.
The main phase of the Nations League will be played on six matchdays of competition...