Teams will be able to make up to five substitutions at Euro 2020 after approval was given by UEFA's executive committee.
The idea of a breakaway European 'Super League' has been emphatically rejected by FIFA and the game's six continental confederations.
Belgium will face France at the Nations Leagues finals tournament in October 2021 with hosts Italy to play Spain in the other semi-final.
Jack Grealish is on track to become a star of Euro 2020, following another impressive England display, says Kaveh Solhekol.
With Euro 2020 delayed, Gareth Southgate can refresh his plans and best XI in the Nations League. But who will seize their chance?