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 team has the first choice as to which of its official sets of playing attire registered online it wears for its home matches.
Up to and including the quarter-finals, the proposed colors will be validated on-site by the referee team.
For matches in the UEFA Champions League path league phase, teams are asked, whenever possible, to wear the playing attires chosen by their senior teams for the corresponding UEFA Champions League match. The playing attires chosen can be changed at the request of the clubs provided the alternative solution does not lead to colour clashes in any part of the attires.
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.
As of the semi-finals, the UEFA administration makes proposals for the playing attires to be worn. The proposals can be changed at the request of the clubs provided that the alternative solution does not lead to clashes in any part of the attires. If no agreement can be found, the UEFA administration takes a final decision.