BK Häcken – Aberdeen FC
Referee: Filip Glova (SVK, photo)
Assistant Referee 1: Daniel Polaček (SVK)
Assistant Referee 2: Peter Bednar (SVK)
Fourth Official: Michal Očenaš (SVK)
VAR: Bartosz Frankowski (POL)
AVAR: Krzysztof Jakubik (POL)
Referee Observer: Carlos Clos Gomez (ESP)
Slavia Praha – Zorya Luhans
Referee: Kristo Tohver (EST)
Assistant Referee 1: Silver Kõiv (EST)
Assistant Referee 2: Sten Klaasen (EST)
Fourth Official: Joonas Jaanovits (EST)
VAR: Dennis Higler (NED)
AVAR: Jochem Kamphuis (NED)
Referee Observer: Stephane Lannoy (FRA)
PFK Ludogorets – AFC Ajax
Referee: Marco Di Bello (ITA)
Assistant Referee 1: Giorgio Peretti (ITA)
Assistant Referee 2: Alessandro Lo Cicero (ITA)
Fourth Official: Ivano Pezzuto (ITA)
VAR: Daniele Chiffi (ITA)
AVAR: Luigi Nasca (ITA)
Referee Observer: Andreas Schluchter (SUI)
Olimpija Ljubljana – Qarabag FK
Referee: Georgi Kabakov (BUL)
Assistant Referee 1: Martin Margaritov (BUL)
Assistant Referee 2: Diyan Valkov (BUL)
Fourth Official: Radoslav Gidzhenov (BUL)
VAR: Dragomir Draganov (BUL)
AVAR: Georgi Dimitrov (BUL)
Referee Observer: Ante Vučemilović-Šimunović (CRO)
GNK Dinamo – Sparta Praha
Referee: Marco Guida (ITA)
Assistant Referee 1: Daniele Bindoni (ITA)
Assistant Referee 2: Alberto Tegoni (ITA)
Fourth Official: Andrea Colombo (ITA)
VAR: Maurizio Mariani (ITA)
AVAR: Francesco Fourneau (ITA)
Referee Observer: Lucilio Batista (POR)
Union Saint Gilloise – FC Lugano
Referee: Enea Jorgji (ALB)
Assistant Referee 1: Denis Rexha (ALB)
Assistant Referee 2: Ridiger Çokaj (ALB)
Fourth Official: Florian Lata (ALB)
VAR: Luca Pairetto (ITA)
AVAR: Marco Serra (ITA)
Referee Observer: Juan Fernandez Marin (ESP)
Slovan Bratislava – Aris Limassol
Referee: William Collum (SCO)
Assistant Referee 1: Francis Connor (SCO)
Assistant Referee 2: David McGeachie (SCO)
Fourth Official: David Dickinson (SCO)
VAR: John Beaton (SCO)
AVAR: Andrew Dallas (SCO)
Referee Observer: Viktor Kassai (HUN)
KI Klaksvik – Sheriff Tiraspol
Referee: Rade Obrenovič (SVN)
Assistant Referee 1: Jure Praprotnik (SVN)
Assistant Referee 2: Grega Kordež (SVN)
Fourth Official: David Šmajc (SVN)
VAR: Matej Jug (SVN)
AVAR: Alen Borošak (SVN)
Referee Observer: Markus Nobs (SUI)
LASK Linz – Zrinjski Mostar
Referee: Orel Grinfeld (ISR)
Assistant Referee 1: Roi Hassan (ISR)
Assistant Referee 2: Idan Yarkoni (ISR)
Fourth Official: Gal Leibovitz (ISR)
VAR: Roi Reinshreiber (ISR)
AVAR: Moshe Bohbot (ISR)
Referee Observer: Karen Nalbandyan (ARM)
Olympiakos SFP – FK Čukarički
Referee: Donatas Rumšas (LTU)
Assistant Referee 1: Aleksandr Radiuš (LTU)
Assistant Referee 2: Dovydas Sužiedėlis (LTU)
Fourth Official: Robertas Valikonis (LTU)
VAR: Tiago Martins (POR)
AVAR: Andre Narciso (POR)
Referee Observer: Markus Strömbergsson (SWE)
