Shakhtar Donetsk – FC Porto
Referee: James Robinson (NIR, photo)
Assistant Referee 1: Andrew Nethery (NIR)
Assistant Referee 2: Adam Jeffrey (NIR)
Fourth Official: Konrad Oldhafer (GER)
Referee Observer: Levan Paniashvili (GEO)
Lazio – Atletico de Madrid
Referee: Mikkel Redder (DEN)
Assistant Referee 1: Rene Risum (DEN)
Assistant Referee 2: Deniz Yurdakul (DEN)
Fourth Official: Ermanno Feliciani (ITA)
Referee Observer: Markus Nobs (SUI)
AC Milan – Newcastle United
Referee: Stefan Ebner (AUT)
Assistant Referee 1: Martin Höfler (AUT)
Assistant Referee 2: Mattias Hartl (AUT)
Fourth Official: Juan Sacchi (ITA)
Referee Observer: Alfredo Trentalange (ITA)
BSC Young Boys – RB Leipzig
Referee: Edgars Maļcevs (LVA)
Assistant Referee 1: Martins Svipsts (LVA)
Assistant Referee 2: Deniss Ševčenko (LVA)
Fourth Official: Mirel Turkes (SUI)
Referee Observer: Jorn-West Larsen (DEN)
Feyenoord Rotterdam – Celtic FC
Referee: Antoni Bandić (BIH)
Assistant Referee 1: Boris Dujmović (BIH)
Assistant Referee 2: Davor Maksimović (BIH)
Fourth Official: Stan Teuben (NED)
Referee Observer: Manuel Diaz Vega (ESP)
Paris St. Germain – Borussia Dortmund
Referee: Sander van der Eijk (NED)
Assistant Referee 1: Rens Bluemink (NED)
Assistant Referee 2: Dyon Fikkert (NED)
Fourth Official: Romain Lissorgue (FRA)
Referee Observer: Stavros Tritsonis (GRE)
Manchester City – Crvena Zvezda
Referee: Marek Radina (CZE)
Assistant Referee 1: Kamil Hajek (CZE)
Assistant Referee 2: Lukaš Machač (CZE)
Fourth Official: Benjamin Speedie (ENG)
Referee Observer: Uno Tutk (EST)
FC Barcelona – Royal Antwerp
Referee: Ishmael Barbara (MLT)
Assistant Referee 1: Duncan Spencer (MLT)
Assistant Referee 2: James Muscat (MLT)
Fourth Official: David Lopez Jimenez (ESP)
Referee Observer: Bernardino Gonzalez Vazquez (ESP)
20 September 2023
Galatasaray – FC Copenhagen
Referee: Snir Levi (ISR)
Assistant Referee 1: Haz Hen (ISR)
Assistant Referee 2: Idan Zoler (ISR)
Fourth Official: Can Cengiz (TUR)
Referee Observer: Leslie Irvine (NIR)
Real Sociedad – Inter Milano
Referee: Henrik Nalbandyan (ARM)
Assistant Referee 1: Mesrop Ghazaryan (ARM)
Assistant Referee 2: Khachatur Hovhannisyan (ARM)
Fourth Official: Ibai Rezola Etxeberria (ESP)
Referee Observer: Tomasz Mikulski (POL)
Sevilla FC – RC Lens
Referee: Gustavo Correia (POR)
Assistant Referee 1: Tiago Costa (POR)
Assistant Referee 2: Paulo Bras (POR)
Fourth Official: Abraham Gutierrez Perera (ESP)
Referee Observer: Dejan Filipovic (SRB)
Arsenal FC – PSV Eindhoven
Referee: Andreas Argyrou (CYP)
Assistant Referee 1: Petros Petrou (CYP)
Assistant Referee 2: Giorgios Charalambous (CYP)
Fourth Official: Scott Tallis (ENG)
Referee Observer: Nuno Castro (POR)
Real Madrid – Union Berlin
Referee: Mohammed Al-Emara (FIN)
Assistant Referee 1: Turkka Valjakka (FIN)
Assistant Referee 2: Riku Vihreävuori (FIN)
Fourth Official: Manuel Perez Hernandez (ESP)
Referee Observer: Alberto Undiano Mallenco (ESP)
SL Benfica – FC Salzburg
Referee: Viktor Kopiyevskyy (UKR)
Assistant Referee 1: Oleksandr Korniyko (UKR)
Assistant Referee 2: Viktor Matyash (UKR)
Fourth Official: Flavio Duarte (POR)
Referee Observer: William Young (SCO)
SC Braga – SSC Napoli
Referee: Amine Kourgheli (BLR)
Assistant Referee 1: Juryj Chomčanka (BLR)
Assistant Referee 2: Viktar Hiecikau (BLR)
Fourth Official: Joao Afonso (POR)
Referee Observer: Rune Pedersen (NOT)
Bayern München – Manchester United
Referee: Lothar D’Hondt (BEL)
Assistant Referee 1: Romain Devillers (BEL)
Assistant Referee 2: Nico Claes (BEL)
Fourth Official: Martin Speckner (GER)
Referee Observer: Robert Schörgenhofer (AUT)
Referee: James Robinson (NIR, photo)
Assistant Referee 1: Andrew Nethery (NIR)
Assistant Referee 2: Adam Jeffrey (NIR)
Fourth Official: Konrad Oldhafer (GER)
Referee Observer: Levan Paniashvili (GEO)
Lazio – Atletico de Madrid
Referee: Mikkel Redder (DEN)
Assistant Referee 1: Rene Risum (DEN)
Assistant Referee 2: Deniz Yurdakul (DEN)
Fourth Official: Ermanno Feliciani (ITA)
Referee Observer: Markus Nobs (SUI)
AC Milan – Newcastle United
Referee: Stefan Ebner (AUT)
Assistant Referee 1: Martin Höfler (AUT)
Assistant Referee 2: Mattias Hartl (AUT)
Fourth Official: Juan Sacchi (ITA)
Referee Observer: Alfredo Trentalange (ITA)
BSC Young Boys – RB Leipzig
Referee: Edgars Maļcevs (LVA)
Assistant Referee 1: Martins Svipsts (LVA)
Assistant Referee 2: Deniss Ševčenko (LVA)
Fourth Official: Mirel Turkes (SUI)
Referee Observer: Jorn-West Larsen (DEN)
Feyenoord Rotterdam – Celtic FC
Referee: Antoni Bandić (BIH)
Assistant Referee 1: Boris Dujmović (BIH)
Assistant Referee 2: Davor Maksimović (BIH)
Fourth Official: Stan Teuben (NED)
Referee Observer: Manuel Diaz Vega (ESP)
Paris St. Germain – Borussia Dortmund
Referee: Sander van der Eijk (NED)
Assistant Referee 1: Rens Bluemink (NED)
Assistant Referee 2: Dyon Fikkert (NED)
Fourth Official: Romain Lissorgue (FRA)
Referee Observer: Stavros Tritsonis (GRE)
Manchester City – Crvena Zvezda
Referee: Marek Radina (CZE)
Assistant Referee 1: Kamil Hajek (CZE)
Assistant Referee 2: Lukaš Machač (CZE)
Fourth Official: Benjamin Speedie (ENG)
Referee Observer: Uno Tutk (EST)
FC Barcelona – Royal Antwerp
Referee: Ishmael Barbara (MLT)
Assistant Referee 1: Duncan Spencer (MLT)
Assistant Referee 2: James Muscat (MLT)
Fourth Official: David Lopez Jimenez (ESP)
Referee Observer: Bernardino Gonzalez Vazquez (ESP)
20 September 2023
Galatasaray – FC Copenhagen
Referee: Snir Levi (ISR)
Assistant Referee 1: Haz Hen (ISR)
Assistant Referee 2: Idan Zoler (ISR)
Fourth Official: Can Cengiz (TUR)
Referee Observer: Leslie Irvine (NIR)
Real Sociedad – Inter Milano
Referee: Henrik Nalbandyan (ARM)
Assistant Referee 1: Mesrop Ghazaryan (ARM)
Assistant Referee 2: Khachatur Hovhannisyan (ARM)
Fourth Official: Ibai Rezola Etxeberria (ESP)
Referee Observer: Tomasz Mikulski (POL)
Sevilla FC – RC Lens
Referee: Gustavo Correia (POR)
Assistant Referee 1: Tiago Costa (POR)
Assistant Referee 2: Paulo Bras (POR)
Fourth Official: Abraham Gutierrez Perera (ESP)
Referee Observer: Dejan Filipovic (SRB)
Arsenal FC – PSV Eindhoven
Referee: Andreas Argyrou (CYP)
Assistant Referee 1: Petros Petrou (CYP)
Assistant Referee 2: Giorgios Charalambous (CYP)
Fourth Official: Scott Tallis (ENG)
Referee Observer: Nuno Castro (POR)
Real Madrid – Union Berlin
Referee: Mohammed Al-Emara (FIN)
Assistant Referee 1: Turkka Valjakka (FIN)
Assistant Referee 2: Riku Vihreävuori (FIN)
Fourth Official: Manuel Perez Hernandez (ESP)
Referee Observer: Alberto Undiano Mallenco (ESP)
SL Benfica – FC Salzburg
Referee: Viktor Kopiyevskyy (UKR)
Assistant Referee 1: Oleksandr Korniyko (UKR)
Assistant Referee 2: Viktor Matyash (UKR)
Fourth Official: Flavio Duarte (POR)
Referee Observer: William Young (SCO)
SC Braga – SSC Napoli
Referee: Amine Kourgheli (BLR)
Assistant Referee 1: Juryj Chomčanka (BLR)
Assistant Referee 2: Viktar Hiecikau (BLR)
Fourth Official: Joao Afonso (POR)
Referee Observer: Rune Pedersen (NOT)
Bayern München – Manchester United
Referee: Lothar D’Hondt (BEL)
Assistant Referee 1: Romain Devillers (BEL)
Assistant Referee 2: Nico Claes (BEL)
Fourth Official: Martin Speckner (GER)
Referee Observer: Robert Schörgenhofer (AUT)
