HJK Helsinki – Buducnost Podgorica
Referee: Nicolas Laforge (BEL, photo)
Assistant Referee 1: Laurent Conotte (BEL)
Assistant Referee 2: Florian Lemaire (BEL)
Fourth Official: Jasper Vergoote (BEL)
Referee Observer: Sabri Çelik (TUR)
Ferencvárosi TC – FC Prishtina
Referee: David Munro (SCO)
Assistant Referee 1: Daniel McFarlane (SCO)
Assistant Referee 2: Calum Spence (SCO)
Fourth Official: Euan Anderson (SCO)
Referee Observer: Tomasz Mikulski (POL)
Flora Tallinn – Hibernians FC
Referee: Lazar Lukić (SRB)
Assistant Referee 1: Dragan Bogićević (SRB)
Assistant Referee 2: Bojan Banović (SRB)
Fourth Official: Momčilo Marković (SRB)
Referee Observer: Kóstas Kapitanís (CYP)
Žalgiris Vilnius – Linfield FC
Referee: Alex Troleis (FRO)
Assistant Referee 1: Dan Hojgaard (FRO)
Assistant Referee 2: Jan Hermansen (FRO)
Fourth Official: Kári á Høvdanum (FRO)
Referee Observer: Mika Peltola (FIN)
CS Fola Esch – Lincoln Red Imps
Referee: Michal Očenáš (SVK)
Assistant Referee 1: Tomáš Vorel (SVK)
Assistant Referee 2: Daniel Poláček (SVK)
Fourth Official: Peter Ziemba (SVK)
Referee Observer: Martin Ingvarsson (SWE)
CFR Cluj – Borac Banja Luka
Referee: Jochem Kamphuis (NED)
Assistant Referee 1: Mario Diks (NED)
Assistant Referee 2: Rogier Honig (NED)
Fourth Official: Joey Kooij (NED)
Referee Observer: Boško Jovanetić (SRB)
KF Shkendija – NS Mura
Referee: António Nobre (POR)
Assistant Referee 1: Pedro Ribeiro (POR)
Assistant Referee 2: Pedro Mota (POR)
Fourth Official: Miguel Nogueira (POR)
Referee Observer: Vladimir Antonov (MDA)
Bodo Glimt – Legia Warszawa
Referee: Juxhin Xhaja (ALB)
Assistant Referee 1: Denis Rexha (ALB)
Assistant Referee 2: Dojando Myftari (ALB)
Fourth Official: Olsid Ferataj (ALB)
Referee Observer: Niklas á Lídarenda (FRO)
Dinamo Tbilisi – Neftçi PFK
Referee: David Fuxman (ISR)
Assistant Referee 1: Nati Dotan (ISR)
Assistant Referee 2: Matityahu Yakobov (ISR)
Fourth Official: Idan Leiba (ISR)
Referee Observer: William Young (SCO)
Slovan Bratislava – Shamrock Rovers
Referee: Sebastian Gishamer (AUT)
Assistant Referee 1: Maximilian Weiss (AUT)
Assistant Referee 2: Jasmin Sabanovic (AUT)
Fourth Official: Stefan Ebner (AUT)
Referee Observer: Lucílio Batista (POR)
Malmö FF – Riga FC
Referee: Kaarlo Hämäläinen (FIN)
Assistant Referee 1: Jan-Peter Aravirta (FIN)
Assistant Referee 2: Sami Nykänen (FIN)
Fourth Official: Antti Munukka (FIN)
Referee Observer: Vladimír Medved (SVK)
KF Teuta – Sheriff Tiraspol
Referee: Amine Kourgheli (BLR)
Assistant Referee 1: Jury Chomčanka (BLR)
Assistant Referee 2: Viktar Hiecikaŭ (BLR)
Fourth Official: Dzianis Ščarbakoŭ (BLR)
Referee Observer: Raymond Ellingham (WAL)
Maccabi Haifa – Qayrat Almati
Referee: Milovan Milačić (MNE)
Assistant Referee 1: Aleksandar Djikanović (MNE)
Assistant Referee 2: Dragan Vujović (MNE)
Fourth Official: Miloš Savović (MNE)
Referee Observer: Sergey Zuev (RUS)
PFC Ludogorets – Šachcior Salihorsk
Referee: Rohit Saggi (NOR)
Assistant Referee 1: Geir Isaksen (NOR)
Assistant Referee 2: Morten Jensen (NOR)
Fourth Official: Marius Grotta (NOR)
Referee Observer: Attila Ábrahám (HUN)
Connah's Quay Nomads – Alashkert FC
Referee: Vasílis Dimitríou (CYP)
Assistant Referee 1: Níkos Englézou (CYP)
Assistant Referee 2: Mários Dimitriádis (CYP)
Fourth Official: Mários Christofórou (CYP)
Referee Observer: Neale Barry (ENG)
GNK Dinamo – Valur
Referee: Genc Nuza (KOS)
Assistant Referee 1: Fatlum Berisha (KOS)
Assistant Referee 2: Bujar Selimaj (KOS)
Fourth Official: Dardan Çaka (KOS)
Referee Observer: Darko Čeferin (SVN)