Qarabag FK – Lech Poznan
Referee: Andrew Madley (ENG, photo)
Assistant Referee 1: Harry Lennard (ENG)
Assistant Referee 2: Wade Smith (ENG)
Fourth Official: Simon Hooper (ENG)
Referee Observer: Rien Koopman (NED)
RFS Riga – HJK Helsinki
Referee: David Fuxman (ISR)
Assistant Referee 1: Matityahu Yakobov (ISR)
Assistant Referee 2: Rostislav Talis (ISR)
Fourth Official: Idan Leiba (ISR)
Referee Observer: Zoran Petrović (SRB)
Zalgiris Vilnius – KF Ballkani
Referee: Kristoffer Hagenes (NOR)
Assistant Referee 1: Kim Haglund (NOR)
Assistant Referee 2: Jan Engan (NOR)
Fourth Official: Daniel Higraff (NOR)
Referee Observer: Darko Čeferin (SVN)
Lincoln Red Imps – FK Skupi
Referee: Filip Glova (SVK)
Assistant Referee 1: Peter Bednar (SVK)
Assistant Referee 2: Daniel Polaček (SVK)
Fourth Official: Peter Kralovič (SVK)
Referee Observer: Gerard Perry (IRL)
Sheriff Tiraspol – HSK Zrinjski
Referee: Radu Petrescu (ROU)
Assistant Referee 1: Radu Ghinguleac (ROU)
Assistant Referee 2:Mircea Grigoriu (ROU)
Fourth Official: Marcel Bîrsan (ROU)
Referee Observer: Markus Nobs (SUI)
KF Tirana – F91 Diddeleng
Referee: Cesar Soto Grado (ESP)
Assistant Referee 1: Iker de Francisco Grijalba (ESP)
Assistant Referee 2: Carlos Alvarez Fernandez (ESP)
Fourth Official: Isidro Diaz de Mera (ESP)
Referee Observer: Alexandru Deaconu (ROU)
KI Klaksvik – Bodo Glimt
Referee: Horațiu Feșnic (ROU)
Assistant Referee 1: Valentin Avram (ROU)
Assistant Referee 2: Alexandru Cerei (ROU)
Fourth Official: Andrei Chivulete (ROU)
Referee Observer: Robert Malek (POL)
Hibernians FC – Shamrock Rovers
Referee: Manfredas Lukjančukas (LTU)
Assistant Referee 1: Vytenis Kazlauskas (LTU)
Assistant Referee 2: Edgaras Bučinskas (LTU)
Fourth Official: Donatas Šimėnas (LTU)
Referee Observer: Christos Nikolaidis (CYP)
FK Sutjeska – PFK Ludogorets
Referee: Gergő Bogar (HUN)
Assistant Referee 1: Balazs Buzas (HUN)
Assistant Referee 2: Theodoros Georgiou (HUN)
Fourth Official: Ferenc Karako (HUN)
Referee Observer: Sabri Celik (TUR)
Vikingur Reykjavik – Malmö FF
Referee: John Beaton (SCO)
Assistant Referee 1: Daniel McFarlane (SCO)
Assistant Referee 2: Douglas Potter (SCO)
Fourth Official: David Dickinson (SCO)
Referee Observer: Pavle Radovanović (MNE)
Sachcior Salihorsk – NK Maribor
Referee: Enea Jorgji (ALB)
Assistant Referee 1: Rejdi Avdo (ALB)
Assistant Referee 2: Ani Koçiaj (ALB)
Fourth Official: Emanuela Rusta (ALB)
Referee Observer: Vitor Melo Pereira (POR)
Dinamo Batumi – Slovan Bratislava
Referee: Antonio Nobre (POR)
Assistant Referee 1: Pedro Martins (POR)
Assistant Referee 2: Pedro Mota (POR)
Fourth Official: Helder Malheiro (POR)
Referee Observer: Jan Wegereef (NED)
Ferencvarosi TC – Tobyl FK
Referee: Krzysztof Jakubik (POL)
Assistant Referee 1: Bartosz Heinig (POL)
Assistant Referee 2: Tomasz Niemirowski (POL)
Fourth Official: Piotr Lasyk (POL)
Referee Observer: Levan Paniashvili (GEO)
CFR Cluj – Pyunik FA
Referee: Michael Fabbri (ITA)
Assistant Referee 1: Marco Bresmes (ITA)
Assistant Referee 2: Domenico Palermo (ITA)
Fourth Official: Alessandro Prontera (ITA)
Referee Observer: Alan Sant (MLT)
Linfield FC – New Saints FC
Referee: Duje Strukan (CRO)
Assistant Referee 1: Bojan Zobenica (CRO)
Assistant Referee 2: Alen Jakšić (CRO)
Fourth Official: Ivan Bebek (CRO)
Referee Observer: Luc Wouters (BEL)