For all competition matches, teams must submit their colours online. For each match, the home team has the first choice as to which of its official sets of playing attire registered online it wears.
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In the qualifying phase and play-offs, the proposed colours will be validated on-site by the referee team.
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For the final tournament, the proposed colours will be validated in advance by the UEFA administration.
In any case, if the referee notices on the spot that the colours of the two teams could lead to confusion, a final decision on the colours is taken in consultation with the UEFA match delegate and the UEFA administration. As a rule, in such cases it is the home team that has to change colours, for practical reasons.