31 July – 1 August 2018
Hapoel Beer Sheva – GNK Dinamo
Referee: François Letexier (FRA, photo)
Assistant Referee 1: Cyril Mugnier (FRA)
Assistant Referee 2: Mehdi Rahmouni (FRA)
Fourth Official: Olivier Thual (FRA)
Referee Observer: Darko Čeferin (SVN)
Sheriff Tiraspol – KF Shkëndija
Referee: Ville Nevalainen (FIN)
Assistant Referee 1: Ville Koskiniemi (FIN)
Assistant Referee 2: Mika Lamppu (FIN)
Fourth Official: Atte Jussila (FIN)
Referee Observer: Vítor Melo Pereira (POR)
Spartak Trnava – Legia Warszawa
Referee: Roi Reinshreiber (ISR)
Assistant Referee 1: Danny Krasikow (ISR)
Assistant Referee 2: Roy Hassan (ISR)
Fourth Official: Daniel Bar Natan (ISR)
Referee Observer: Alexandru Deaconu (ROU)
HJK Helsinki – Bate Borisov
Referee: Jonathan Lardot (BEL)
Assistant Referee 1: Frédéric Godelaine (BEL)
Assistant Referee 2: Florian Lemaire (BEL)
Fourth Official: Jan Boterberg (BEL)
Referee Observer: Terje Hauge (NOR)
Midtjylland – Astana
Referee: Juan Martínez Munuera (ESP)
Assistant Referee 1: Diego Barbero Sevilla (ESP)
Assistant Referee 2: César Manuel Noval (ESP)
Fourth Official: Mario Melero López (ESP)
Referee Observer: Gylfi Orrason (ISL)
Qarabağ – Kukësi
Referee: Peter Královič (SVK)
Assistant Referee 1: Miroslav Benko (SVK)
Assistant Referee 2: Erik Weiss (SVK)
Fourth Official: Patrik Hrčka (SVK)
Referee Observer: Paulius Malžinskas (LTU)
Malmö FF – CFR Cluj
Referee: Andrew Dallas (SCO)
Assistant Referee 1: Graeme Stewart (SCO)
Assistant Referee 2: Douglas Ross (SCO)
Fourth Official: Donald Robertson (SCO)
Referee Observer: Lassin Isaksen (FRO)
FK Sūduva – Crvena Zvezda
Referee: Tiago Martins (POR)
Assistant Referee 1: Luís Campos (POR)
Assistant Referee 2: Pedro Almeida (POR)
Fourth Official: Luís Godinho (POR)
Referee Observer: Matteo Trefoloni (ITA)
Vidi FC – PFC Ludogorets
Referee: Manuel Schüttengruber (AUT)
Assistant Referee 1: Robert Steinacher (AUT)
Assistant Referee 2: Andreas Rothmann (AUT)
Fourth Official: René Eisner (AUT)
Referee Observer: Raymond Ellingham (WAL)
Basel – PAOK
Referee: Paolo Valeri (ITA)
Assistant Referee 1: Alessandro Giallatini (ITA)
Assistant Referee 2: Alberto Tegoni (ITA)
Fourth Official: Maurizio Mariani (ITA)
Referee Observer: Vladimír Medved (SVK)
Sturm Graz – AFC Ajax
Referee: Bartosz Frankowski (POL)
Assistant Referee 1: Marcin Boniek (POL)
Assistant Referee 2: Jakub Winkler (POL)
Fourth Official: Krzysztof Jakubik (POL)
Referee Observer: Martin Ingvarsson (SWE)
Rosenborg – Celtic
Referee: Sandro Schärer (SUI)
Assistant Referee 1: Bekim Zogaj (SUI)
Assistant Referee 2: Jonas Erni (SUI)
Fourth Official: Lukas Fähndrich (SUI)
Referee Observer: Luciano Luci (ITA)