The four sides based in England and Scotland have been given their groups for the upcoming UEFA Europa League, with Celtic arguably getting the hardest draw.
The draws were conducted on Friday.
Celtic have been placed with Salzburg, RB Leipzig and Rosenborg.
Arsenal have Sporting Lisbon, Qarabag, and Vorskla Poltava, whereas Chelsea are in the very last group, L, PAOK Saloniki, BATE Borisov, and Vidi.
The other Scottish team in the competition, Rangers, have Villareal, Rapid Vienna, and Spartak Moscow.
Group A: Bayer Leverkusen (Ger), Ludogorets Razgrad (Bul), FC Zurich (Swi), AEK Larnaca (Cyp)
Group B: Salzburg (Aut), Celtic, RB Leipzig (Ger), Rosenborg (Nor)
Group C: Zenit St Petersburg (Rus), FC Copenhagen (Den), Bordeaux (Fra), Slavia Prague (Cze)
Group D: Anderlecht (Bel), Fenerbahce (Tur), Dinamo Zagreb (Cro), Spartak Trnava (Svk)
Group E: Arsenal, Sporting Lisbon (Por), Qarabag (Aze), Vorskla Poltava (Ukr)
Group F: Olympiakos (Gre), AC Milan (Ita), Real Betis (Spa), Dudelange (Lux)
Group G: Villarreal (Spa), Rapid Vienna (Aut), Spartak Moscow (Rus), Rangers
Group H: Lazio (Ita), Marseille (Fra), Eintracht Frankfurt (Ger), Apollon Limassol (Cyp)
Group I: Besiktas (Tur), KRC Genk (Bel), Malmo (Swe), Sarpsborg (Nor)
Group J: Sevilla (Spa), Krasnodar (Rus), Standard Liege (Bel), Akhisar Belediyespor (Tur)
Group K: Dynamo Kiev (Ukr), Astana (Kaz), Rennes (Fra), Jablonec (Cze)
Group L: Chelsea, PAOK Saloniki (Gre), BATE Borisov (Blr), Vidi (Hun)
Week 1 – September 20
Week 2 – October 4
Week 3 – October 25
Week 4 – November 8
Week 5 – November 29
Week 6 – December 13
The final of the Europa League will be held in Baku, Azerbaijan on May 28, 2019.