FSV Mainz – FC Barcelona
Referee: Mikkel Redder DEN (photo)
Assistant Referee 1: Deniz Yurdakul DEN
Assistant Referee 2: Rene Risum DEN
Fourth Official: Patrick Schwengers GER
Referee Observer: Peter Sippel GER
FC Midtjylland – RB Leipzig
Referee: Antoni Bandić BIH
Assistant Referee 1: Amir Kadić BIH
Assistant Referee 2: Stefan Tešanović BIH
Fourth Official: Jacob Karlsen DEN
Referee Observer: Leslie Irvine NIR
Olympiakos SFP – Inter Milano
Referee: Miguel Nogueira POR
Assistant Referee 1: Hugo Marques POR
Assistant Referee 2: Francisco Pereira POR
Fourth Official: Georgios Balachoutis GRE
Referee Observer: Stavros Tritsonis GRE
FK Partizan – SC Braga
Referee: Lothar D’Hondt BEL
Assistant Referee 1: Romain Devillers BEL
Assistant Referee 2: Nico Claes BEL
Fourth Official: Milan Stefanović SRB
Referee Observer: Laszlo Vagner HUN
AZ Alkmaar – Atletico de Madrid
Referee: Chrysovalandis Theouli CYP
Assistant Referee 1: Kyriakos Sokratous CYP
Assistant Referee 2: Georgios Charalambous CYP
Fourth Official: Wouter Wiersma NED
Referee Observer: Jan Wegereef NED
MSK Zilina – Borussia Dortmund
Referee: Joonas Jaanovits EST
Assistant Referee 1: Aron Härsing EST
Assistant Referee 2: Sander Saga EST
Fourth Official: Michal Očenaš SVK
Referee Observer: Ladislav Gadoši SVK
FC Basel – Bayern München
Referee: Ante Čulina CRO
Assistant Referee 1: Luka Pušić CRO
Assistant Referee 2: Dario Kolarević CRO
Fourth Official: Johannes von Mandach SUI
Referee Observer: Markus Nobs SUI
FC Nantes – Sevilla FC
Referee: Oliver Reitala FIN
Assistant Referee 1: Olli Jantunen FIN
Assistant Referee 2: Jukka Honkanen FIN
Fourth Official: Guillaume Paradis FRA
Referee Observer: Christof Dierick BEL
Referee: Mikkel Redder DEN (photo)
Assistant Referee 1: Deniz Yurdakul DEN
Assistant Referee 2: Rene Risum DEN
Fourth Official: Patrick Schwengers GER
Referee Observer: Peter Sippel GER
FC Midtjylland – RB Leipzig
Referee: Antoni Bandić BIH
Assistant Referee 1: Amir Kadić BIH
Assistant Referee 2: Stefan Tešanović BIH
Fourth Official: Jacob Karlsen DEN
Referee Observer: Leslie Irvine NIR
Olympiakos SFP – Inter Milano
Referee: Miguel Nogueira POR
Assistant Referee 1: Hugo Marques POR
Assistant Referee 2: Francisco Pereira POR
Fourth Official: Georgios Balachoutis GRE
Referee Observer: Stavros Tritsonis GRE
FK Partizan – SC Braga
Referee: Lothar D’Hondt BEL
Assistant Referee 1: Romain Devillers BEL
Assistant Referee 2: Nico Claes BEL
Fourth Official: Milan Stefanović SRB
Referee Observer: Laszlo Vagner HUN
AZ Alkmaar – Atletico de Madrid
Referee: Chrysovalandis Theouli CYP
Assistant Referee 1: Kyriakos Sokratous CYP
Assistant Referee 2: Georgios Charalambous CYP
Fourth Official: Wouter Wiersma NED
Referee Observer: Jan Wegereef NED
MSK Zilina – Borussia Dortmund
Referee: Joonas Jaanovits EST
Assistant Referee 1: Aron Härsing EST
Assistant Referee 2: Sander Saga EST
Fourth Official: Michal Očenaš SVK
Referee Observer: Ladislav Gadoši SVK
FC Basel – Bayern München
Referee: Ante Čulina CRO
Assistant Referee 1: Luka Pušić CRO
Assistant Referee 2: Dario Kolarević CRO
Fourth Official: Johannes von Mandach SUI
Referee Observer: Markus Nobs SUI
FC Nantes – Sevilla FC
Referee: Oliver Reitala FIN
Assistant Referee 1: Olli Jantunen FIN
Assistant Referee 2: Jukka Honkanen FIN
Fourth Official: Guillaume Paradis FRA
Referee Observer: Christof Dierick BEL