Referee: Dalibor Černy CZE (photo)
Assistant Referee 1: Jan Paták CZE
Assistant Referee 2: Kamil Hájek CZE
Fourth Official: Jan Petřík CZE
VAR: Tomáš Kocourek CZE
AVAR: Miroslav Zelinka CZE
Referee Observer: Daniele Orsato ITA
Shakhtar Donetsk – Breidablik
Referee: Andrei Chivulete ROU
Assistant Referee 1: Radu Ghinguleac ROU
Assistant Referee 2: Cristian Ilinca ROU
Fourth Official: Radu Petrescu ROU
VAR: Sebastian Colțescu ROU
AVAR: Sorin Costreie ROU
Referee Observer: Vadims Direktorenko LVA
Sparta Praha – Rakow Czestochowa
Referee: Joonas Jaanovits EST
Assistant Referee 1: Aron Härsing EST
Assistant Referee 2: Veiko Motsnik EST
Fourth Official: Kevin Kaivoja EST
VAR: Marko Liiva EST
AVAR: Juri Frischer EST
Referee Observer: Herbert Fandel GER
FSV Mainz – AC Fiorentina
Referee: Lawrence Visser BEL
Assistant Referee 1: Ruben Wyns BEL
Assistant Referee 2: Thibaud Nijssen BEL
Fourth Official: Wesli De Cremer BEL
VAR: Jan Boterberg BEL
AVAR: Ella De Vries BEL
Referee Observer: Rusmir Mrković BIH
NK Celje – Legia Warszawa
Referee: Javier Alberola Rojas ESP
Assistant Referee 1: Alfredo Rodríguez Moreno ESP
Assistant Referee 2: Iker de Francisco Grijalba ESP
Fourth Official: Adrián Cordero Vega ESP
VAR: Valentín Pizarro Gómez ESP
AVAR: Francisco Hernández Maeso ESP
Referee Observer: Aliaksiej Kulbakou BLR
KUPS Kuopio – Slovan Bratislava
Referee: Chrístos Vergétis GRE
Assistant Referee 1: Andréas Fotópoulos GRE
Assistant Referee 2: Konstantínos Stáikos GRE
Fourth Official: Aléxandros Katsikogiánnis GRE
VAR: Lukas Fähndrich SUI
AVAR: Konstantínos Poulikídis GRE
Referee Observer: Haim Yaakov ISR
AEK Athens – Shamrock Rovers
Referee: José Munuera Montero ESP
Assistant Referee 1: Diego Barbero Sevilla ESP
Assistant Referee 2: Antonio Martínez Moreno ESP
Fourth Official: Alejandro Quintero González ESP
VAR: Juan Martínez Munuera ESP
AVAR: Jorge Figueroa Vázquez ESP
Referee Observer: Sven Bindels LUX
Samsunspor – Hamrun Spartans
Referee: Bolat Sariev KAZ
Assistant Referee 1: Sergei Vasiutin KAZ
Assistant Referee 2: Denis Labaşov KAZ
Fourth Official: Arman Esmuratov KAZ
VAR: Darren England ENG
AVAR: Daniiar Sahi KAZ
Referee Observer: Andrejs Sipailo LVA
Noa FA – Sigma Olomouc
Referee: Mohammad Aslam NOR
Assistant Referee 1: Anders Dale NOR
Assistant Referee 2: Alf Rossland NOR
Fourth Official: Daniel Higraff NOR
VAR: Kristoffer Hagenes NOR
AVAR: Marius Lien NOR
Referee Observer: Pavel Salii KAZ
Crystal Palace – AZ Alkmaar
Referee: Daniele Chiffi ITA
Assistant Referee 1: Valerio Colarossi ITA
Assistant Referee 2: Davide Moro ITA
Fourth Official: Luca Zufferli ITA
VAR: Daniele Doveri ITA
AVAR: Rosario Abisso ITA
Referee Observer: Thóroddur Hjaltalín ISL
Rapid Wien – Universitatea Craiova
Referee: Martin Matoša SVN
Assistant Referee 1: Aleksandar Kasapovič SVN
Assistant Referee 2: Matic Mežnar SVN
Fourth Official: Rade Obrenovič SVN
VAR: Asmir Sagrkovič SVN
AVAR: Aleksandar Matkovič SVN
Referee Observer: Ognjen Valjić BIH
Dynamo Kyiv – Zrinjski Mostar
Referee: Marc Nagtegaal NED
Assistant Referee 1: Dyon Fikkert NED
Assistant Referee 2: Murat Kücükerbir NED
Fourth Official: Alex Bos NED
VAR: Erwin Blank NED
AVAR: Edwin van de Graaf NED
Referee Observer: Ian Stokes IRL
Rayo Vallecano – Lech Poznan
Referee: Viktor Kopiyevskyy UKR
Assistant Referee 1: Semen Shlonchak UKR
Assistant Referee 2: Viktor Nyzhnyk UKR
Fourth Official: Oleksandr Kalonov UKR
VAR: Denys Shurman UKR
AVAR: Oleksandr Shandor UKR
Referee Observer: Clayton Pisani MLT
Lincoln Red Imps – HNK Rijeka
Referee: Philip Farrugia MLT
Assistant Referee 1: Duncan Sultana MLT
Assistant Referee 2: Jurgen Spiteri MLT
Fourth Official: Alex Johnson MLT
VAR: Gianluca Aureliano ITA
AVAR: Fabio Maresca ITA
Referee Observer: Mark Whitby WAL
KF Shkendija – Jagiellonia Bialystok
Referee: Mihály Káprály HUN
Assistant Referee 1: István Albert HUN
Assistant Referee 2: Gergő Vígh-Tarsonyi HUN
Fourth Official: Marcell Derdák HUN
VAR: Tamás Bognár HUN
AVAR: Ferenc Karakó HUN
Referee Observer: Asim Xudiyev AZE
BK Hacken – RC Strasbourg
Referee: Luca Pairetto ITA
Assistant Referee 1: Giorgio Peretti ITA
Assistant Referee 2: Khaled Bahri ITA
Fourth Official: Giovanni Ayroldi ITA
VAR: Valerio Marini ITA
AVAR: Federico La Penna ITA
Referee Observer: Nenad Djokić SRB
FC Lausanne – Omonia Nicosia
Referee: Edgars Maļcevs LVA
Assistant Referee 1: Martiņš Svipsts LVA
Assistant Referee 2: Deniss Ševčenko LVA
Fourth Official: Aleksandrs Anufrijevs LVA
VAR: Kristaps Ratnieks LVA
AVAR: Andrejs Gluhovs LVA
Referee Observer: Mika Peltola FIN
Shelbourne FC – FC Drita
Referee: Oliver Reitala FIN
Assistant Referee 1: Jukka Honkanen FIN
Assistant Referee 2: Olli Jantunen FIN
Fourth Official: Antti Munukka FIN
VAR: Pascal Müller GER
AVAR: Katrin Rafalski GER
Referee Observer: Marco Fritz GER