18-19 July 2017FC København – MŠK Žilina
Referee: Jonathan Lardot (BEL)
Assistant Referee 1: Frédéric Godelaine (BEL)
Assistant Referee 2: Vito Di Vincenzo (BEL)
Fourth Official: Christof Dierick (BEL)
Referee Observer: Matteo Trefoloni (ITA)
FC Astana – Spartaks Jurmala
Referee: Charalampos Kalogeropoulos (GRE)
Assistant Referee 1: Tryfon Petropoulos (GRE)
Assistant Referee 2: Alexandros Grevenis (GRE)
Fourth Official: Praxitelis Zachariadis (GRE)
Referee Observer: Elmir Pilav (BIH)
Vardar – Malmö
Referee: Anatolii Zhabchenko (UKR)
Assistant Referee 1: Oleksandr Voytyuk (UKR)
Assistant Referee 2: Sergii Bekker (UKR)
Fourth Official: Oleksandr Derdo (UKR)
Referee Observer: Nuno Castro (POR)
Alashkert – Bate Borisov
Referee: Peter Kralovic (SVK)
Assistant Referee 1: Miroslav Benko (SVK)
Assistant Referee 2: Erik Weiss (SVK)
Fourth Official: Pavel Suniar (SVK)
Referee Observer: Uno Tutk (EST)
Samtredia – Qarabağ
Referee: Srdjan Jovanović (SRB)
Assistant Referee 1: Uroš Stojković (SRB)
Assistant Referee 2: Milan Mihajlović (SRB)
Fourth Official: Marko Popović (SRB)
Referee Observer: László Vagner (HUN)
Víkingur Gøta – FH Hafnarfjörður
Referee: Ville Nevalainen (FIN)
Assistant Referee 1: Jan-Peter Aravirta (FIN)
Assistant Referee 2: Mika Lamppu (FIN)
Fourth Official: Dennis Antamo (FIN)
Referee Observer: Ichko Lozev (BUL)
The New Saints – HNK Rijeka
Referee: Georgi Kabakov (BUL)
Assistant Referee 1: Martin Margaritov (BUL)
Assistant Referee 2: Georgi Doynov (BUL)
Fourth Official: Stanislav Todorov (BUL)
Referee Observer: Markus Nobs (SUI)
Budućnost Podgorica – FK Partizan
Referee: Roi Reinshreiber (ISR)
Assistant Referee 1: Amihay Mozes (ISR)
Assistant Referee 2: David Morhaim (ISR)
Fourth Official: Gal Leibovitz (ISR)
Referee Observer: Luciano Luci (ITA)
F91 Dudelange – Apoel FC
Referee: Nikola Dabanović (MNE)
Assistant Referee 1: Jovica Tatar (MNE)
Assistant Referee 2: Dragan Vujović (MNE)
Fourth Official: Miloš Bošković (MNE)
Referee Observer: Zbigniew Przesmycki (POL)
Rosenborg – Dundalk
Referee: Aliyar Aghayev (AZE)
Assistant Referee 1: Zeynal Zeynalov (AZE)
Assistant Referee 2: Rza Mammadov (AZE)
Fourth Official: Orkhan Mammadov (AZE)
Referee Observer: Peter Jones (ENG)
Kukësi – Sheriff
Referee: Irfan Peljto (BIH)
Assistant Referee 1: Davor Beljo (BIH)
Assistant Referee 2: Amer Macić (BIH)
Fourth Official: Haris Kaljanac (BIH)
Observer: Kristinn Jakobsson (ISL)
Ludogorets – Žalgiris Vilnius
Referee: Mads-Kristoffer Kristoffersen (DEN)
Assistant Referee 1: Henrik Sønderby (DEN)
Assistant Referee 2: Dennis Rasmussen (DEN)
Fourth Official: Anders Poulsen (DEN)
Referee Observer: Haim Jakov (ISR)
NK Maribor – HŠK Zrinjski
Referee: Ola Hobber Nilsen (NOR)
Assistant Referee 1: Tom Harald Grønevik (NOR)
Assistant Referee 2: Geir-Oskar Isaksen (NOR)
Fourth Official: Kai Erik Steen (NOR)
Referee Observer: Jan Wegereef (NED)
Salzburg – Hibernians
Referee: Sergey Lapochkin (RUS)
Assistant Referee 1: Aleksei Lebedev (RUS)
Assistant Referee 2: Aleksandr Kudriavtsev (RUS)
Fourth Official: Evgeny Turbin (RUS)
Referee Observer: John Fleming (SCO)
Legia Warszawa – IFK Mariehamn
Referee: Tiago Lopes (POR)
Assistant Referee 1: Luis Ferreira (POR)
Assistant Referee 2: Rui Martins (POR)
Fourth Official: Bruno Paixão (POR)
Referee Observer: Carmel Agius (MLT)
Celtic – Linfield
Referee: Stephan Klossner (SUI)
Assistant Referee 1: Remy Zgraggen (SUI)
Assistant Referee 2: Efe Kurnazca (SUI)
Fourth Official: Urs Schnyder (SUI)
Referee Observer: Michael Argyrou (CYP)
Budapest Honvéd – Hapoel Beer Sheva
Referee: Davide Massa (ITA)
Assistant Referee 1: Andrea Crispo (ITA)
Assistant Referee 2: Alberto Tegoni (ITA)
Fourth Official: Claudio Gavillucci (ITA)
Referee Observer: Alexandru Deaconu (ROU)