FSV Mainz – Sigma Olomouc
Referee: Andris Treimanis LVA (photo)
Assistant Referee 1: Haralds Gudermanis LVA
Assistant Referee 2: Aleksejs Spasennikovs LVA
Fourth Official: Aleksandrs Golubevs LVA
VAR: Kristaps Ratnieks LVA
AVAR: Vitalijs Spasjonnikovs LVA
Referee Observer: Boško Jovanetić SRB
Rakow Czestochowa – AC Fiorentina
Referee: Juan Martínez Munuera ESP
Assistant Referee 1: Raúl Cabañero Martinez ESP
Assistant Referee 2: Iñigo Prieto Lopez ESP
Fourth Official: Alejandro Muñiz Ruiz ESP
VAR: Guillermo Cuadra Fernández ESP
AVAR: Javier Iglesias Villanueva ESP
Referee Observer: Michal Beneš CZE
AEK Athens – NK Celje
Referee: Simone Sozza ITA
Assistant Referee 1: Davide Imperiale ITA
Assistant Referee 2: Alessio Berti ITA
Fourth Official: Giovanni Ayroldi ITA
VAR: Luca Pairetto ITA
AVAR: Daniele Doveri ITA
Referee Observer: Viktor Kassai HUN
AEK Larnaca – Crystal Palace
Referee: Aliyar Aghayev AZE
Assistant Referee 1: Zeynal Zeynalov AZE
Assistant Referee 2: Akif Amirali AZE
Fourth Official: Elchin Masiyev AZE
VAR: Jeroen Manschot NED
AVAR: Nicat Ismayilli AZE
Referee Observer: Alberto Undiano Mallenco
Shakhtar Donetsk – Lech Poznan
Referee: Sander van der Eijk NED
Assistant Referee 1: Rens Bluemink NED
Assistant Referee 2: Stefan De Groot NED
Fourth Official: Marc Nagtegaal NED
VAR: Clay Ruperti NED
AVAR: Richard Martens NED
Referee Observer: Fredy Fautrel FRA
Sparta Praha – AZ Alkmaar
Referee: Srdjan Jovanović SRB
Assistant Referee 1: Uroš Stojković SRB
Assistant Referee 2: Milan Mihajlović SRB
Fourth Official: Novak Simović SRB
VAR: Momčilo Marković SRB
AVAR: Jelena Cvetković SRB
Referee Observer: Thomas Einwaller AUT
Rayo Vallecano – Samsunspor
Referee: Sascha Stegemann GER
Assistant Referee 1: Christof Günsch GER
Assistant Referee 2: Marco Achmüller GER
Fourth Official: Martin Petersen GER
VAR: Benjamin Brand GER
AVAR: Pascal Müller GER
Referee Observer: Gediminas Mažeika LTU
RC Strasbourg – HNK Rijeka
Referee: Mykola Balakin UKR
Assistant Referee 1: Oleksandr Berkut UKR
Assistant Referee 2: Viktor Matyash UKR
Fourth Official: Vitaliy Romanov UKR
VAR: Denys Shurman UKR
AVAR: Dmytro Panchyshyn UKR
Referee Observer: Markus Strömbergsson SWE
