Inter Milano – Real Sociedad
Referee: Antoni Bandić BIH (photo)
Assistant Referee 1: Stefan Tešanović BIH
Assistant Referee 2: Emir Zahiragić BIH
Fourth Official: Davide Ghersini ITA
Referee Observer: Alexandru Deaconu ROU
RC Lens – Sevilla FC
Referee: Matthew De Gabriele MLT
Assistant Referee 1: Jurgen Spiteri MLT
Assistant Referee 2: Shaun Calleja MLT
Fourth Official: Marc Bollengier FRA
Referee Observer: Gylfi Orrason ISL
Union Berlin – Real Madrid
Referee: Joonas Jaanovits EST
Assistant Referee 1: Aron Härsing EST
Assistant Referee 2: Erkko Liiv EST
Fourth Official: Max Burda GER
Referee Observer: Laurent Duhamel FRA
PSV Eindhoven – Arsenal FC
Referee: Ante Čulina CRO
Assistant Referee 1: Luka Pušić CRO
Assistant Referee 2: Dario Kolarević CRO
Fourth Official: Stan Teuben NED
Referee Observer: Michael Ross NIR
FC Salzburg – SL Benfica
Referee: Michal Očenaš SVK
Assistant Referee 1: Adam Jekkel SVK
Assistant Referee 2: Tobiaš Pacak SVK
Fourth Official: Daniel Pfister AUT
Referee Observer: Emil Bozinovski MKD
Manchester United – Bayern München
Referee: Vasilios Fotias GRE
Assistant Referee 1: Andreas Meindanas GRE
Assistant Referee 2: Michail Papadakis GRE
Fourth Official: Scott Jackson ENG
Referee Observer: Juan Fernandez Marin ESP
FC Copenhagen – Galatasaray
Referee: Jovan Kačevski MKD
Assistant Referee 1: Kuštrim Lika MKD
Assistant Referee 2: Daniel Vasilevski MKD
Fourth Official: Jakob Sundberg DEN
Referee Observer: Jens Larsen DEN
SSC Napoli – SC Braga
Referee: Igor Stojčevski MKD
Assistant Referee 1: Branko Putilin MKD
Assistant Referee 2: Slaǵan Markoski MKD
Fourth Official: Ivano Pezzuto ITA
Referee Observer: Alfredo Trentalange ITA
13 December 2023
RB Leipzig – BSC Young Boys
Referee: Oliver Reitala FIN
Assistant Referee 1: Olli Jantunen FIN
Assistant Referee 2: Christian De Casseres FIN
Fourth Official: Daniel Bartnitzki GER
Referee Observer: Karel Vidlak CZE
Newcastle United – AC Milan
Referee: Jan Petrik CZE
Assistant Referee 1: Lukaš Matoušek CZE
Assistant Referee 2: Martin Leška CZE
Fourth Official: Anthony Backhouse ENG
Referee Observer: Andreas Schluchter SUI
Crvena Zvezda – Manchester City
Referee: Saiat Qarabaev KAZ
Assistant Referee 1: Dmitrii Belogradov KAZ
Assistant Referee 2: Samat Tergeusizov KAZ
Fourth Official: Andrija Stojanović SRB
Referee Observer: Boško Jovanetić SRB
Royal Antwerp – FC Barcelona
Referee: Ivo Fernandes LUX
Assistant Referee 1: Rafael Morim LUX
Assistant Referee 2: Yannick Mentz LUX
Fourth Official: Michael Allaerts BEL
Referee Observer: Leslie Irvine NIR
Celtic FC – Feyenoord Rotterdam
Referee: Mohammad Aslam NOR
Assistant Referee 1: Tom Gronevik NOR
Assistant Referee 2: Jorgen Valstadsve NOR
Fourth Official: Duncan Williams SCO
Referee Observer: Kenneth Clark SCO
FC Porto – Shakhtar Donetsk
Referee: Marek Radina CZE
Assistant Referee 1: Lukaš Machač CZE
Assistant Referee 2: Jan Vana CZE
Fourth Official: Miguel Fonseca POR
Referee Observer: Markus Nobs SUI
Atletico de Madrid – Lazio
Referee: Miloš Milanović SRB
Assistant Referee 1: Nikola Rijavec SRB
Assistant Referee 2: Nemanja Jovanović-Džajić SRB
Fourth Official: Alvaro Rodriguez Recio ESP
Referee Observer: Carlos Clos Gomez ESP
Borussia Dortmund – Paris St. Germain
Referee: Genc Nuza KOS
Assistant Referee 1: Edmond Zeqiri KOS
Assistant Referee 2: Fatmir Sekiraqa KOS
Fourth Official: Patrick Schwengers GER
Referee Observer: Marinus Koopman NED
Assistant Referee 1: Stefan Tešanović BIH
Assistant Referee 2: Emir Zahiragić BIH
Fourth Official: Davide Ghersini ITA
Referee Observer: Alexandru Deaconu ROU
RC Lens – Sevilla FC
Referee: Matthew De Gabriele MLT
Assistant Referee 1: Jurgen Spiteri MLT
Assistant Referee 2: Shaun Calleja MLT
Fourth Official: Marc Bollengier FRA
Referee Observer: Gylfi Orrason ISL
Union Berlin – Real Madrid
Referee: Joonas Jaanovits EST
Assistant Referee 1: Aron Härsing EST
Assistant Referee 2: Erkko Liiv EST
Fourth Official: Max Burda GER
Referee Observer: Laurent Duhamel FRA
PSV Eindhoven – Arsenal FC
Referee: Ante Čulina CRO
Assistant Referee 1: Luka Pušić CRO
Assistant Referee 2: Dario Kolarević CRO
Fourth Official: Stan Teuben NED
Referee Observer: Michael Ross NIR
FC Salzburg – SL Benfica
Referee: Michal Očenaš SVK
Assistant Referee 1: Adam Jekkel SVK
Assistant Referee 2: Tobiaš Pacak SVK
Fourth Official: Daniel Pfister AUT
Referee Observer: Emil Bozinovski MKD
Manchester United – Bayern München
Referee: Vasilios Fotias GRE
Assistant Referee 1: Andreas Meindanas GRE
Assistant Referee 2: Michail Papadakis GRE
Fourth Official: Scott Jackson ENG
Referee Observer: Juan Fernandez Marin ESP
FC Copenhagen – Galatasaray
Referee: Jovan Kačevski MKD
Assistant Referee 1: Kuštrim Lika MKD
Assistant Referee 2: Daniel Vasilevski MKD
Fourth Official: Jakob Sundberg DEN
Referee Observer: Jens Larsen DEN
SSC Napoli – SC Braga
Referee: Igor Stojčevski MKD
Assistant Referee 1: Branko Putilin MKD
Assistant Referee 2: Slaǵan Markoski MKD
Fourth Official: Ivano Pezzuto ITA
Referee Observer: Alfredo Trentalange ITA
13 December 2023
RB Leipzig – BSC Young Boys
Referee: Oliver Reitala FIN
Assistant Referee 1: Olli Jantunen FIN
Assistant Referee 2: Christian De Casseres FIN
Fourth Official: Daniel Bartnitzki GER
Referee Observer: Karel Vidlak CZE
Newcastle United – AC Milan
Referee: Jan Petrik CZE
Assistant Referee 1: Lukaš Matoušek CZE
Assistant Referee 2: Martin Leška CZE
Fourth Official: Anthony Backhouse ENG
Referee Observer: Andreas Schluchter SUI
Crvena Zvezda – Manchester City
Referee: Saiat Qarabaev KAZ
Assistant Referee 1: Dmitrii Belogradov KAZ
Assistant Referee 2: Samat Tergeusizov KAZ
Fourth Official: Andrija Stojanović SRB
Referee Observer: Boško Jovanetić SRB
Royal Antwerp – FC Barcelona
Referee: Ivo Fernandes LUX
Assistant Referee 1: Rafael Morim LUX
Assistant Referee 2: Yannick Mentz LUX
Fourth Official: Michael Allaerts BEL
Referee Observer: Leslie Irvine NIR
Celtic FC – Feyenoord Rotterdam
Referee: Mohammad Aslam NOR
Assistant Referee 1: Tom Gronevik NOR
Assistant Referee 2: Jorgen Valstadsve NOR
Fourth Official: Duncan Williams SCO
Referee Observer: Kenneth Clark SCO
FC Porto – Shakhtar Donetsk
Referee: Marek Radina CZE
Assistant Referee 1: Lukaš Machač CZE
Assistant Referee 2: Jan Vana CZE
Fourth Official: Miguel Fonseca POR
Referee Observer: Markus Nobs SUI
Atletico de Madrid – Lazio
Referee: Miloš Milanović SRB
Assistant Referee 1: Nikola Rijavec SRB
Assistant Referee 2: Nemanja Jovanović-Džajić SRB
Fourth Official: Alvaro Rodriguez Recio ESP
Referee Observer: Carlos Clos Gomez ESP
Borussia Dortmund – Paris St. Germain
Referee: Genc Nuza KOS
Assistant Referee 1: Edmond Zeqiri KOS
Assistant Referee 2: Fatmir Sekiraqa KOS
Fourth Official: Patrick Schwengers GER
Referee Observer: Marinus Koopman NED
