For all competition matches, teams must submit the agreed playing attire colours to be worn for each match via the dedicated online tool. The home club has the first choice as to which of its official playing attires registered via the dedicated online tool it wears for its home matches.
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In the qualifying phase, the proposed colours will be validated onsite by the referee team.
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As of the group stage, 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.
For the final, both teams may wear their first choice playing attire. However, if there is a clash, the team designated as the away team must wear alternative colours. The UEFA administration proposes suitably contrasting colours in advance of the match.