17-18 July 2018Celtic – Alashkert
Referee: Horațiu Feșnic (ROU, photo)
Assistant Referee 1: Mihai Artene (ROU)
Assistant Referee 2: Valentin Avram (ROU)
Fourth Official: Andrei Chivulete (ROU)
Referee Observer: Jaap Uilenberg (NED)
HJK Helsinki – Víkingur
Referee: Duje Strukan (CRO)
Assistant Referee 1: Goran Perica (CRO)
Assistant Referee 2: Mario Pepur (CRO)
Fourth Official: Goran Gabrilo (CRO)
Referee Observer: Gevorg Hovhannisyan (ARM)
Apoel – Sūduva
Referee: Glenn Nyberg (SWE)
Assistant Referee 1: Magnus Sjöblom (SWE)
Assistant Referee 2: Fredrik Klyver (SWE)
Fourth Official: Magnus Lindgren (SWE)
Referee Observer: Draženko Kovačić (CRO)
Malmö FF – KF Drita
Referee: Laurent Kopriwa (LUX)
Assistant Referee 1: Claude Ries (LUX)
Assistant Referee 2: Gilles Becker (LUX)
Fourth Official: Ricardo Morais (LUX)
Referee Observer: Uno Tutk (EST)
Hapoel Beer Sheva – Flora Tallinn
Referee: Tomasz Musiał (POL)
Assistant Referee 1: Radosław Siejka (POL)
Assistant Referee 2: Sebastian Mucha (POL)
Fourth Official: Tomasz Kwiatkowski (POL)
Referee Observer: Miroslav Vitković (CRO)
The New Saints – KF Shkëndija
Referee: Pavel Orel (CZE)
Assistant Referee 1: Petr Blažej (CZE)
Assistant Referee 2: Petr Caletka (CZE)
Fourth Official: Ondřej Lerch (CZE)
Referee Observer: Drago Kos (SVN)
Valletta FC – FK Kukësi
Referee: Igor Pajač (CRO)
Assistant Referee 1: Ivica Modrić (CRO)
Assistant Referee 2: Vedran Djurak (CRO)
Fourth Official: Fran Jović (CRO)
Referee Observer: Shmuel Shteif (ISR)
Videoton FC – F91 Dudelange
Referee: Donald Robertson (SCO)
Assistant Referee 1: Francis Connor (SCO)
Assistant Referee 2: Stuart Stevenson (SCO)
Fourth Official: Barry Cook (SCO)
Referee Observer: Robert Małek (POL)
Crvena Zvezda – Spartaks Jūrmala
Referee: Alper Ulusoy (TUR)
Assistant Referee 1: Ekrem Kan (TUR)
Assistant Referee 2: Ali Ögel (TUR)
Fourth Official: Arda Kardeşler (TUR)
Referee Observer: Sergey Zuyev (RUS)
Crusaders – Ludogorets
Referee: Roomer Tarajev (EST)
Assistant Referee 1: Sten Klaasen (EST)
Assistant Referee 2: Veiko Mõtsnik (EST)
Fourth Official: Siim Rinken (EST)
Referee Observer: Ilkka Koho (FIN)
Legia Warszawa – Cork City
Referee: Kai Erik Steen (NOR)
Assistant Referee 1: Jan Erik Engan (NOR)
Assistant Referee 2: Tom Harald Grønevik (NOR)
Fourth Official: Kristoffer Hagenes (NOR)
Referee Observer: Goran Mihaljević (MNE)
FC Sheriff – Torpedo Kutaisi
Referee: Peter Andersen (DEN)
Assistant Referee 1: Niels Brixen (DEN)
Assistant Referee 2: Dennis Rasmussen (DEN)
Fourth Official: Jørgen Daugbjerg (DEN)
Referee Observer: Rune Pedersen (NOR)
Qarabağ FK – Olimpija Ljubljana
Referee: Erez Papir (ISR)
Assistant Referee 1: David Bitton (ISR)
Assistant Referee 2: Eliyahu Casapu (ISR)
Fourth Official: David Fuxman (ISR)
Referee Observer: Sokol Jareci (ALB)
HŠK Zrinjski – Spartak Trnava
Referee: Julian Weinberger (AUT)
Assistant Referee 1: Maximilian Kolbitsch (AUT)
Assistant Referee 2: Andreas Heidenreich (AUT)
Fourth Official: Markus Hameter (AUT)
Referee Observer: Frank De Bleeckere (BEL)
Rosenborg BK – Valur Reykjavík
Referee: Stefan Apostolov (BUL)
Assistant Referee 1: Veselin Dobriyanov (BUL)
Assistant Referee 2: Petar Dzhuganski (BUL)
Fourth Official: Ivaylo Stoyanov (BUL)
Referee Observer: Robert Sedlacek (AUT)
FK Sutjeska – FC Astana
Referee: João Pinheiro (POR)
Assistant Referee 1: Rui Tavares (POR)
Assistant Referee 2: Bruno Rodrigues (POR)
Fourth Official: Vítor Ferreira (POR)
Referee Observer: Marián Ružbarský (SVK)