In UEFA club competitions, sponsor advertising is permitted on non-playing attire tops, subject to the provisions of Article 27 and according to the following principles:
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A team may advertise for one single non-playing attire sponsor only.
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A team may advertise for the approved sponsor for all home and away matches during the same UEFA season.
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The non-playing attire sponsor used must be either:
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sponsor advertising approved beforehand by the member association and which is also in use by that team in one of the official domestic competitions as a specific non-playing attire sponsor; or
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the UEFA-approved sponsor advertising used on the playing shirt.
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Only one single element of sponsor advertising is permitted, in the following maximum sizes:
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20cm² on anthem jackets;
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200cm² on all other non-playing attire tops.