Seeding pot 1

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  Arsenal   Zenit Saint Petersburg   Lyon   Dynamo Kyiv   Villarreal   Athletic Bilbao   Lazio   Milan   Viktoria Plzeň   Red Bull Salzburg   Copenhagen   Braga

Seeding pot 2

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  Steaua București   Ludogorets Razgrad   BATE Borisov   Everton   Young Boys   Marseille   Real Sociedad   Maccabi Tel Aviv   Lokomotiv Moscow   Austria Wien   Hertha BSC   Nice

Seeding pot 3

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  Astana   Partizan   1899 Hoffenheim   1. FC Köln   Rijeka   Vitória de Guimarães   Atalanta   Zulte Waregem   Zorya Luhansk   Rosenborg   Sheriff Tiraspol

Seeding pot 4

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  Apollon Limassol   İstanbul Başakşehir   Konyaspor   Vitesse   Slavia Prague   Red Star Belgrade   Skënderbeu Korçë   Fastav Zlín   AEK Athens   Lugano   Vardar   Östersund