Shakhtar Donetsk – Legia Warszawa
Referee: Gustavo Correia POR (photo)
Assistant Referee 1: André Dias POR
Assistant Referee 2: Tiago Costa POR
Fourth Official: Cláudio Pereira POR
VAR: André Narciso POR
AVAR: Bruno Esteves POR
Referee Observer: Igor Pristovnik CRO
Rapid Wien – AC Fiorentina
Referee: Yigal Frid ISR
Assistant Referee 1: Rostislav Talis ISR
Assistant Referee 2: Tuval Koltunoff ISR
Fourth Official: Nael Odeh ISR
VAR: Daniel Natan ISR
AVAR: Eli Hakmon ISR
Referee Observer: Aleksandar Stavrev MKD
RC Strasbourg – Jagiellonia Bialystok
Referee: Dario Bel CRO
Assistant Referee 1: Ivan Janić CRO
Assistant Referee 2: Kristijan Novosel CRO
Fourth Official: Duje Strukan CRO
VAR: Mario Zebec CRO
AVAR: Fran Jović CRO
Referee Observer: William Collum SCO
HNK Rijeka – Sparta Praha
Referee: Robert Jones ENG
Assistant Referee 1: Lee Betts ENG
Assistant Referee 2: Neil Davies ENG
Fourth Official: Anthony Harrington ENG
VAR: Matthew Donohue ENG
AVAR: Timothy Wood ENG
Referee Observer: Hannes Kaasik EST
AEK Athens – Aberdeen FC
Referee: Jasper Vergoote BEL
Assistant Referee 1: Michele Seeldraeyers BEL
Assistant Referee 2: Martijn Tiesters BEL
Fourth Official: Kevin Van Damme BEL
VAR: Jan Boterberg BEL
AVAR: Ella De Vries BEL
Referee Observer: Cüneyt Çakir TUR
FC Drita – Omonia Nicosia
Referee: Robert Harvey IRL
Assistant Referee 1: Robert Clarke IRL
Assistant Referee 2: Wayne McDonnell IRL
Fourth Official: Paul McLaughlin IRL
VAR: Kevin Clancy SCO
AVAR: Ryan Lee SCO
Referee Observer: Yevhen Aranovskyy UKR
Breidablik – KUPS Kuopio
Referee: Sandi Putros DEN
Assistant Referee 1: Deniz Yurdakul DEN
Assistant Referee 2: Steffen Bramsen DEN
Fourth Official: Aydin Uslu DEN
VAR: Mads-Kristoffer Kristoffersen DEN
AVAR: Michael Tykgaard DEN
Referee Observer: Ferenc Székely HUN
KF Shkendija – Shelbourne FC
Referee: Stefan Ebner AUT
Assistant Referee 1: Robert Steinacher AUT
Assistant Referee 2: Martin Höfler AUT
Fourth Official: Julian Weinberger AUT
VAR: Alan Kijas AUT
AVAR: Josef Spurny AUT
Referee Observer: Michaíl Argyroú CYP
BK Hacken – Rayo Vallecano
Referee: Antoni Bandić BIH
Assistant Referee 1: Amir Kadić BIH
Assistant Referee 2: Nebojša Žugić BIH
Fourth Official: Nihad Ljajić BIH
VAR: Alen Borošak SVN
AVAR: Mateo Musa BIH
Referee Observer: Uno Tutk EST
AZ Alkmaar – Slovan Bratislava
Referee: Tobias Stieler GER
Assistant Referee 1: Lasse Koslowski GER
Assistant Referee 2: Mark Borsch GER
Fourth Official: Matthias Jöllenbeck GER
VAR: Sascha Stegemann GER
AVAR: Benjamin Cortus GER
Referee Observer: Chrístos Nikolaidis CYP
Crystal Palace – AEK Larnaca
Referee: Damian Kos POL
Assistant Referee 1: Bartosz Heinig POL
Assistant Referee 2: Marek Arys POL
Fourth Official: Damian Sylwestrzak POL
VAR: Piotr Lasyk POL
AVAR: Paweł Malec POL
Referee Observer: Ruud Bossen NED
Shamrock Rovers – NK Celje
Referee: Ondřej Berka CZE
Assistant Referee 1: Ivo Nádvorník CZE
Assistant Referee 2: Jan Paták CZE
Fourth Official: Ondřej Pechanec CZE
VAR: Tomáš Kocourek CZE
AVAR: Miroslav Zelinka CZE
Referee Observer: Bernardino González Vázquez ESP
FSV Mainz – Zrinjski Mostar
Referee: James Robinson NIR
Assistant Referee 1: Andrew Nethery NIR
Assistant Referee 2: Adam Jeffrey NIR
Fourth Official: Ben McMaster NIR
VAR: Erwin Blank NED
AVAR: Edwin van de Graaf NED
Referee Observer: Goran Mihaljević MNE
Lincoln Red Imps – Lech Poznan
Referee: Chrysovalándis Theoulí CYP
Assistant Referee 1: Mários Kalogírou CYP
Assistant Referee 2: Pávlos Georgíou CYP
Fourth Official: Konstandínos Fellás CYP
VAR: Dimítris Solomoú CYP
AVAR: Rovértos Kósta CYP
Referee Observer: Ladislav Gádoši SVK
Sigma Olomouc – Rakow Czestochowa
Referee: Pavle Ilić SRB
Assistant Referee 1: Nikola Djorović SRB
Assistant Referee 2: Svetozar Živin SRB
Fourth Official: Pavle Tomić SRB
VAR: Aleksandar Živković SRB
AVAR: Lazar Lukić SRB
Referee Observer: Bariş Şimşek TUR
Samsunspor – Dynamo Kyiv
Referee: Ivar Kristjánsson ISL
Assistant Referee 1: Birkir Sigurdarson ISL
Assistant Referee 2: Gylfi Sigurdsson ISL
Fourth Official: Vilhjálmur Thórarinsson ISL
VAR: Manuel Schüttengruber AUT
AVAR: Alexander Harkam AUT
Referee Observer: Nicolae Grigorescu ROU
Universitatea Craiova – Noa FA
Referee: Gal Leibovitz ISR
Assistant Referee 1: Dor Medina ISR
Assistant Referee 2: Yossi Babayoff ISR
Fourth Official: Dekel Zino ISR
VAR: Eitan Shmuelevitz ISR
AVAR: Shalom Avraham ISR
Referee Observer: Simon Evans WAL
Hamrun Spartans – Lausanne Sport
Referee: Henrik Nalbandyan ARM
Assistant Referee 1: Mesrop Ghazaryan ARM
Assistant Referee 2: Atom Sevgulyan ARM
Fourth Official: Ashot Ghaltakhchyan ARM
VAR: Zaven Hovhannisyan ARM
AVAR: Yura Mahtesyan ARM
Referee Observer: Alieh Čykun BLR