Referee: David Šmajc SVN (photo)
Assistant Referee 1: Aleksandar Kasapovič SVN
Assistant Referee 2: Tomaž Černe SVN
Fourth Official: Can Cengiz TUR
Referee Observer: Bernardino Gonzalez ESP
Sevilla FC – Arsenal FC
Referee: Miloš Gigović BIH
Assistant Referee 1: Damir Lazić BIH
Assistant Referee 2: Amer Macić BIH
Fourth Official: Ignacio de Santisteban Adame ESP
Referee Observer: Domenico Messina ITA
RC Lens – PSV Eindhoven
Referee: Mohammed Al-Emara FIN
Assistant Referee 1: Turkka Valjakka FIN
Assistant Referee 2: Mika Lamppu FIN
Fourth Official: Marc Bollengier FRA
Referee Observer: Rune Pedersen NOR
Inter Milano – FC Salzburg
Referee: Edgars Maļcevs LVA
Assistant Referee 1: Martins Svipsts LVA
Assistant Referee 2: Deniss Ševčenko LVA
Fourth Official: Davide Ghersini ITA
Referee Observer: Alfredo Trentalange ITA
Manchester United – FC Copenhagen
Referee: Robert Hennessy IRL
Assistant Referee 1: Darragh Keegan IRL
Assistant Referee 2: Eoin Harte IRL
Fourth Official: Scott Tallis ENG
Referee Observer: Kevin Parry WAL
Union Berlin – SSC Napoli
Referee: Jan Petrik CZE
Assistant Referee 1: Kamil Hajek CZE
Assistant Referee 2: Jan Hurych CZE
Fourth Official: Florian Lechner GER
Referee Observer: Ladislav Gadosi SVK
SC Braga – Real Madrid
Referee: Joey Kooij NED
Assistant Referee 1: Roy de Nas NED
Assistant Referee 2: Dyon Fikkert NED
Fourth Official: Marcio Torres POR
Referee Observer: Salustia Cipres AND
SL Benfica – Real Sociedad
Referee: Miloš Bošković MNE
Assistant Referee 1: Nikola Radulović MNE
Assistant Referee 2: Marko Gojković MNE
Fourth Official: Diogo Rosa POR
Referee Observer: Stephen Tanner ENG
25 October 2023
Feyenoord – Lazio
Referee: Joonas Jaanovits EST
Assistant Referee 1: Aron Härsing EST
Assistant Referee 2: Riivo Stolts EST
Fourth Official: Alex Bos NED
Referee Observer: Stephane Lannoy FRA
Paris St. Germain – AC Milan
Referee: Alessandro Dudič SUI
Assistant Referee 1: Alain Heiniger SUI
Assistant Referee 2: Nicolas Müller SUI
Fourth Official: Romain Lissorgue FRA
Referee Observer: Tomasz Mikulski POL
FC Barcelona – Shakhtar Donetsk
Referee: Menelaos Antoniou CYP
Assistant Referee 1: Marios Kalogirou CYP
Assistant Referee 2: Iraklis Komodromos CYP
Fourth Official: David Lopez Jimenez ESP
Referee Observer: Christof Dierick BEL
Royal Antwerp – FC Porto
Referee: Genc Nuza KOS
Assistant Referee 1: Drilon Rexhepi KOS
Assistant Referee 2: Altin Zhegrova KOS
Fourth Official: Michael Allaerts BEL
Referee Observer: Volodymyr Petrov UKR
Young Boys – Manchester City
Referee: Daniiar Sahi KAZ
Assistant Referee 1: Sergei Kalatşev KAZ
Assistant Referee 2: Iurii Tihoniuk KAZ
Fourth Official: Anojen Kanagasingam SUI
Referee Observer: Carlos Velasco Carballo ESP
Celtic FC – Atletico de Madrid
Referee: Ondrej Berka CZE
Assistant Referee 1: Matej Vlček CZE
Assistant Referee 2: Jakub Hrabovsky CZE
Fourth Official: Calum Scott SCO
Referee Observer: Kenneth Clark SCO
RB Leipzig – Crvena Zvezda
Referee: Igor Stojčevski MKD
Assistant Referee 1: Kuštrim Lika MKD
Assistant Referee 2: Slagan Markoski MKD
Fourth Official: Richard Hempel GER
Referee Observer: Alain Hamer LUX
Newcastle United – Borussia Dortmund
Referee: Oliver Reitala FIN
Assistant Referee 1: Olli Jantunen FIN
Assistant Referee 2: Christian De Casseres FIN
Fourth Official: Benjamin Speedie ENG
Referee Observer: Martin Atkinson ENG
