Intern Milano – SL Benfica
Referee: Robert Jenkins WAL (photo)
Assistant Referee 1: Ian Bird WAL
Assistant Referee 2: Jordan Christopher WAL
Fourth Official: Marco Piccinini ITA
Referee Observer: Stefan Messner AUT
Union Berlin – SC Braga
Referee: Kyriakos Athanasiou CYP
Assistant Referee 1: Evagoras Evagorou CYP
Assistant Referee 2: Marios Stylianou CYP
Fourth Official: Florian Lechner GER
Referee Observer: Darko Čeferin SVN
RC Lens – Arsenal FC
Referee: Jasper Vergoote BEL
Assistant Referee 1: Michael Geerolf BEL
Assistant Referee 2: Martijn Tiesters BEL
Fourth Official: Marc Bollengier FRA
Referee Observer: Vladimir Antonov MDA
SSC Napoli – Real Madrid
Referee: Jakob Sundberg DEN
Assistant Referee 1: Deniz Yurdakul DEN
Assistant Referee 2: Rene Risum DEN
Fourth Official: Luca Massimi ITA
Referee Observer: Emil Bozinovski MKD
FC Salzburg – Real Sociedad
Referee: Radoslav Gidzhenov BUL
Assistant Referee 1: Deniz Sokolov BUL
Assistant Referee 2: Petar Mitrev BUL
Fourth Official: Arnes Talic AUT
Referee Observer: Antonio Damato ITA
Manchester United – Galatasaray
Referee: Sivert Amland NOR
Assistant Referee 1: Geir Isaksen NOR
Assistant Referee 2: Ole Haukasen NOR
Fourth Official: Scott Jackson ENG
Referee Observer: Martin Hansson SWE
FC Copenhagen – Bayern München
Referee: Thomas Owen WAL
Assistant Referee 1: Martin Roberts WAL
Assistant Referee 2: Connor Thomas WAL
Fourth Official: Simon Rasmussen DEN
Referee Observer: Michael Johansen DEN
PSV Eindhoven – Sevilla FC
Referee: Goga Kikacheishvili GEO
Assistant Referee 1: Davit Akhvlediani GEO
Assistant Referee 2: Davit Gabisonia GEO
Fourth Official: Stan Teuben NED
Referee Observer: Renatus Temmink NED
4 October 2023
Royal Antwerp – Shakhtar Donetsk
Referee: Roman Jitari MDA
Assistant Referee 1: Vadim Vicol MDA
Assistant Referee 2: Alexandru Sajin MDA
Fourth Official: Michael Allaerts BEL
Referee Observer: Luc Wouters BEL
Atletico de Madrid – Feyenoord Rotterdam
Referee: Ante Čulina CRO
Assistant Referee 1: Dario Kolarević CRO
Assistant Referee 2: Ivan Starčević CRO
Fourth Official: Alvaro Rodriguez Recio ESP
Referee Observer: Laurent Duhamel FRA
Borussia Dortmund – AC Milan
Referee: John Brooks ENG
Assistant Referee 1: Wade Smith ENG
Assistant Referee 2: Nick Greenhalgh ENG
Fourth Official: Robin Braun GER
Referee Observer: Terje Hauge NOR
RB Leipzig – Manchester City
Referee: Miguel Nogueira POR
Assistant Referee 1: Hugo Marques POR
Assistant Referee 2: Francisco Pereira POR
Fourth Official: Daniel Bartnitzki GER
Referee Observer: Markus Strömbergsson SWE
Celtic – Lazio
Referee: Helgi Jonasson ISL
Assistant Referee 1: Egill Gudlaugsson ISL
Assistant Referee 2: Eysteinn Hrafnkelsson ISL
Fourth Official: Peter Stuart SCO
Referee Observer: Peter Sippel GER
Newcastle United – Paris St. Germain
Referee: Mohammad Aslam NOR
Assistant Referee 1: Tom Gronevik NOR
Assistant Referee 2: Jorgen Valstadsve NOR
Fourth Official: Anthony Backhouse ENG
Referee Observer: Stefan Johannesson SWE
Crvena Zvezda – Young Boys
Referee: Dzmitryj Dzmitryjeu BLR
Assistant Referee 1: Dzianis Jemialjančykau BLR
Assistant Referee 2: Anton Palujanau BLR
Fourth Official: Danilo Nikolić SRB
Referee Observer: Nenad Djokić SRB
FC Porto – FC Barcelona
Referee: Miloš Gigović BIH
Assistant Referee 1: Amer Macić BIH
Assistant Referee 2: Nebojša Žugić BIH
Fourth Official: Miguel Fonseca POR
Referee Observer: Lucilio Batista POR
Referee: Robert Jenkins WAL (photo)
Assistant Referee 1: Ian Bird WAL
Assistant Referee 2: Jordan Christopher WAL
Fourth Official: Marco Piccinini ITA
Referee Observer: Stefan Messner AUT
Union Berlin – SC Braga
Referee: Kyriakos Athanasiou CYP
Assistant Referee 1: Evagoras Evagorou CYP
Assistant Referee 2: Marios Stylianou CYP
Fourth Official: Florian Lechner GER
Referee Observer: Darko Čeferin SVN
RC Lens – Arsenal FC
Referee: Jasper Vergoote BEL
Assistant Referee 1: Michael Geerolf BEL
Assistant Referee 2: Martijn Tiesters BEL
Fourth Official: Marc Bollengier FRA
Referee Observer: Vladimir Antonov MDA
SSC Napoli – Real Madrid
Referee: Jakob Sundberg DEN
Assistant Referee 1: Deniz Yurdakul DEN
Assistant Referee 2: Rene Risum DEN
Fourth Official: Luca Massimi ITA
Referee Observer: Emil Bozinovski MKD
FC Salzburg – Real Sociedad
Referee: Radoslav Gidzhenov BUL
Assistant Referee 1: Deniz Sokolov BUL
Assistant Referee 2: Petar Mitrev BUL
Fourth Official: Arnes Talic AUT
Referee Observer: Antonio Damato ITA
Manchester United – Galatasaray
Referee: Sivert Amland NOR
Assistant Referee 1: Geir Isaksen NOR
Assistant Referee 2: Ole Haukasen NOR
Fourth Official: Scott Jackson ENG
Referee Observer: Martin Hansson SWE
FC Copenhagen – Bayern München
Referee: Thomas Owen WAL
Assistant Referee 1: Martin Roberts WAL
Assistant Referee 2: Connor Thomas WAL
Fourth Official: Simon Rasmussen DEN
Referee Observer: Michael Johansen DEN
PSV Eindhoven – Sevilla FC
Referee: Goga Kikacheishvili GEO
Assistant Referee 1: Davit Akhvlediani GEO
Assistant Referee 2: Davit Gabisonia GEO
Fourth Official: Stan Teuben NED
Referee Observer: Renatus Temmink NED
4 October 2023
Royal Antwerp – Shakhtar Donetsk
Referee: Roman Jitari MDA
Assistant Referee 1: Vadim Vicol MDA
Assistant Referee 2: Alexandru Sajin MDA
Fourth Official: Michael Allaerts BEL
Referee Observer: Luc Wouters BEL
Atletico de Madrid – Feyenoord Rotterdam
Referee: Ante Čulina CRO
Assistant Referee 1: Dario Kolarević CRO
Assistant Referee 2: Ivan Starčević CRO
Fourth Official: Alvaro Rodriguez Recio ESP
Referee Observer: Laurent Duhamel FRA
Borussia Dortmund – AC Milan
Referee: John Brooks ENG
Assistant Referee 1: Wade Smith ENG
Assistant Referee 2: Nick Greenhalgh ENG
Fourth Official: Robin Braun GER
Referee Observer: Terje Hauge NOR
RB Leipzig – Manchester City
Referee: Miguel Nogueira POR
Assistant Referee 1: Hugo Marques POR
Assistant Referee 2: Francisco Pereira POR
Fourth Official: Daniel Bartnitzki GER
Referee Observer: Markus Strömbergsson SWE
Celtic – Lazio
Referee: Helgi Jonasson ISL
Assistant Referee 1: Egill Gudlaugsson ISL
Assistant Referee 2: Eysteinn Hrafnkelsson ISL
Fourth Official: Peter Stuart SCO
Referee Observer: Peter Sippel GER
Newcastle United – Paris St. Germain
Referee: Mohammad Aslam NOR
Assistant Referee 1: Tom Gronevik NOR
Assistant Referee 2: Jorgen Valstadsve NOR
Fourth Official: Anthony Backhouse ENG
Referee Observer: Stefan Johannesson SWE
Crvena Zvezda – Young Boys
Referee: Dzmitryj Dzmitryjeu BLR
Assistant Referee 1: Dzianis Jemialjančykau BLR
Assistant Referee 2: Anton Palujanau BLR
Fourth Official: Danilo Nikolić SRB
Referee Observer: Nenad Djokić SRB
FC Porto – FC Barcelona
Referee: Miloš Gigović BIH
Assistant Referee 1: Amer Macić BIH
Assistant Referee 2: Nebojša Žugić BIH
Fourth Official: Miguel Fonseca POR
Referee Observer: Lucilio Batista POR
