For all competition matches, teams must submit the agreed playing attire colours to be worn for each match via the dedicated online tool. Team A has the first choice as to which of its official sets of playing attire registered online it wears for the match in question.
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In the qualifying competition, the proposed colours are validated on-site by the referee team.
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For the final tournament, the proposed colours are validated in advance by the UEFA administration.
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 Team A that has to change colours.