Arsenal and Celtic will find out today which opponents stand between them and a place in the Champions League group stage.
The draw for the competition's play-off round takes places at UEFA headquarters in Switzerland and is scheduled to get under way at 10.45am.
Arsenal and Celtic are in separate draws and cannot be paired together, and each club has five potential opponents.
The Londoners are seeded in the draw for teams who qualified as non-champions and count Real Sociedad, Fenerbahce, PSV Eindhoven, Ukrainians Metalist Karkhiv and Pacos de Ferreira of Portugal as possible opponents.
Celtic, who came through a third-round qualifier against Elfsborg earlier this week, are in the draw for national champions.
Neil Lennon's side are also seeded and will play one of Legia Warsaw, Austria Vienna, Slovenians Maribor, Kazakhstan champions Shakhter Karagandy or Bulgarian side Ludogorets Razgrad.
The ten play-off matches will be played over two legs, the first on August 20/21 and the second the following week.
The Europa League play-off draw follows in Nyon at midday, and both Tottenham and Swansea are seeded.
Swansea's potential opponents include Greek side Atromitos and Romanians Petrolul Ploiesti, while FC Thun of Switzerland and Czechs Slovan Liberec are among six clubs Spurs could face.