The group-stage draw was revealed on Friday as trio Liverpool, and Brighton learned their fates.
Liverpool have been placed in Group E along with Austrian club LASK, Belgium’s Royale Union Saint-Gilloise and Toulouse of France.
West Ham, , are in Group A alongside Greek side Olympiacos, Bundesliga team Freiburg and Serbian club FK TSC Backa Topola.
Brighton are playing in the Europa League for the first time in the club’s history and find themselves in Group B with Dutch giants Ajax, French side Marseille and AEK Athens of Greece.
EUROPA LEAGUE GROUP A
FK TSC Backa Topola
EUROPA LEAGUE GROUP B
EUROPA LEAGUE GROUP C
EUROPA LEAGUE GROUP E
Royale Union Saint-Gilloise
Scottish runners-up Rangers dropped into the Europa League after losing to PSV in Champions League qualifying and the Glasgow side will take on La Liga team Real Betis, Czech champions Sparta Prague and Cyprus’ Aris Limassol in Group C.
Jose Mourinho’s Roma, who finished as Europa League runners-up last term, have been paired with Slavia Prague, Sheriff Tiraspol and Servette in Group G.
Group D will see Italian side Atalanta and Sporting Lisbon battle it out with Sturm Graz and Rakow Czestochowa.
In Group F, Spanish club Villarreal take on Rennes, Maccabi Haifa and Panathinaikos.
The last four teams taking part in Group H include Bayer Leverkusen, Qarabag, Molde and Hacken.
Sevilla are the current Europa League champions after the draw was made on Thursday.