The first round of matches will be played on Thursday, 17th September.
The top two teams from each group will qualify for the last 32 and will be joined by the eight third-placed teams from the Champions League group phase.
Europa League group stages:
Group A
Ajax Amsterdam
Anderlecht
Dinamo Zagreb
Politehnica Timisoara
Group B
Valencia
Lille
Slavia Prague
Genoa
Group C
Hamburg
Celtic
Hapoel Tel-Aviv
Rapid Vienna
Group D
Sporting Lisbon
Heerenveen
Hertha Berlin
FK Ventspils
Group E
Roma
FC Basel
Fulham
CSKA Sofia
Group F
Panathinaikos
Galatasaray
Dinamo Bucharest
Sturm Graz
Group G
Villarreal
Lazio
Levski Sofia
Red Bull Salzbug
Group H
Steaua Bucharest
Fenerbahce
FC Twente
FC Sheriff
Group I
Benfica
Everton
AEK Athens
BATE Borisov
Group J
Shakhtar Donetsk
Club Brugge
Partizan Belgrade
Toulouse
Group K
PSV Eindhoven
FC Copenhagen
Sparta Prague
CFR Cluj
Group L
Werder Bremen
Austria Vienna
Athletic Bilbao
Nacional