AC Fiorentina – Jagiellonia Bialystok
Referee: Srdjan Jovanović SRB (photo)
Assistant Referee 1: Uroš Stojković SRB
Assistant Referee 2: Miloš Simović SRB
Fourth Official: Novak Simović SRB
VAR: Benjamin Brand GER
AVAR: Aleksandar Živković SRB
Referee Observer: Jan Wegereef NED
Samsunspor – KF Shkendija
Referee: Simone Sozza ITA
Assistant Referee 1: Davide Imperiale ITA
Assistant Referee 2: Alessio Berti ITA
Fourth Official: Kevin Bonacina ITA
VAR: Valerio Marini ITA
AVAR: Daniele Doveri ITA
Referee Observer: Stéphane Lannoy FRA
NK Celje – FC Drita
Referee: Damian Sylwestrzak POL
Assistant Referee 1: Paweł Sokolnicki POL
Assistant Referee 2: Adam Karasewicz POL
Fourth Official: Lukasz Kuzma POL
VAR: Piotr Lasyk POL
AVAR: Pawel Malec POL
Referee Observer: Gylfi Orrason ISL.
HNK Rijeka – Omonia Nicosia
Referee: Mykola Balakin UKR
Assistant Referee 1: Oleksandr Berkut UKR
Assistant Referee 2: Viktor Matyash UKR
Fourth Official: Vitaliy Romanov UKR
VAR: Viktor Kopiievskyi UKR
AVAR: Dmytro Panchyshyn UKR
Referee Observer: Bernardino González Vázquez ESP
Lech Poznan – KUPS Kuopio
Referee: Vassilis Fotias GRE
Assistant Referee 1: Andreas Meintanas GRE
Assistant Referee 2: Michail Papadakis GRE
Fourth Official: Alexandros Tsakalidis GRE
VAR: Angelos Evangelou GRE
AVAR: Spyridon Zampalas GRE
Referee Observer: Robert Schörgenhofer AUT
AZ Alkmaar – Noa FA
Referee: Nikola Dabanović MNE
Assistant Referee 1: Vladan Todorović MNE
Assistant Referee 2: Srdjan Jovanović MNE
Fourth Official: Miloš Bošković MNE
VAR: Ivan Bebek CRO
AVAR: Mario Zebec CRO
Referee Observer: Michalis Argyrou CYP
Crystal Palace – Zrinjski Mostar
Referee: Luis Godinho POR
Assistant Referee 1: Pedro Almeida POR
Assistant Referee 2: Rui Teixeira POR
Fourth Official: Fabio Verissimo POR
VAR: André Narciso POR
AVAR: Bruno Esteves POR
Referee Observer: Marián Ružbarský SVK
FC Lausanne Sport – Sigma Olomouc
Referee: Nenad Minaković SRB
Assistant Referee 1: Nikola Borović SRB
Assistant Referee 2: Boško Božović SRB
Fourth Official: Milan Mitić SRB
VAR: Momčilo Marković SRB
AVAR: Jelena Cvetković SRB
Referee Observer: Paweł Gil POL