Seeding pot 1
editArsenal Zenit Saint Petersburg Lyon Dynamo Kyiv Villarreal Athletic Bilbao Lazio Milan Viktoria Plzeň Red Bull Salzburg Copenhagen Braga
Seeding pot 2
editSteaua București Ludogorets Razgrad BATE Borisov Everton Young Boys Marseille Real Sociedad Maccabi Tel Aviv Lokomotiv Moscow Austria Wien Hertha BSC Nice
Seeding pot 3
editAstana Partizan 1899 Hoffenheim 1. FC Köln Rijeka Vitória de Guimarães Atalanta Zulte Waregem Zorya Luhansk Rosenborg Sheriff Tiraspol
Seeding pot 4
editApollon Limassol İstanbul Başakşehir Konyaspor Vitesse Slavia Prague Red Star Belgrade Skënderbeu Korçë Fastav Zlín AEK Athens Lugano Vardar Östersund