Of those teams, eight have dropped down from the Champions League.
Arsenal and Manchester United went through as group winners and will be seeded for the draw.
Here is a list of team left in the competition:
Seeded:
Ajax (dropping from Champions League)
Benfica (dropping from Champions League)
Inter Milan (dropping from Champions League)
RB Salzburg (dropping from Champions League)
Sevilla (Group A winners)
Malmo (Group B winners)
FC Basel (Group C winners)
LASK (Group D winners)
Celtic (Group E winners)
Arsenal (Group F winners)
Porto (Group G winners)
Espanyol (Group H winners)
Gent (Group I winners)
Istanbul Basaksehir (Group J winners)
Braga (Group K winners)
Manchester United (Group L winners)
Unseeded
Club Brugge (dropping from Champions League)
Bayer Leverkusen (dropping from Champions League)
Olympiacos (dropping from Champions League)
Shakhtar Donetsk (dropping from Champions League)
APOEL (Group A runners-up)
FC Copenhagen (Group B runners-up)
Getafe (Group C runners-up)
Sporting (Group D runners-up)
CFR Cluj (Group E runners-up)
Eintract Frankfurt (Group F runners-up)
Rangers (Group G runners-up)
Ludogorets (Group H runners-up)
Wolfsburg (Group I runners-up)
Roma (Group J runners-up)
Wolves (Group K runners-up)
AZ Alkmaar (Group L runners-up)
The Europa League last 32 draw takes place at 12pm GMT on Monday, December 16, 2019.
