FC Porto – NK Domžale
Referee: Nicolas Laforge (BEL, photo)
Assistant Referee 1: Jimmy Cremers (BEL)
Assistant Referee 2: Romain Devillers (BEL)
Fourth Official: João Gonçalves (POR)
Referee Observer: João Ferreira (POR)
FC Midtjylland – HŠK Zrinjski
Referee: Kaspar Sjöberg (SWE)
Assistant Referee 1: Andreas Söderkvist (SWE)
Assistant Referee 2: Niklas Nyberg (SWE)
Fourth Official: Morten Krogh (DEN)
Referee Observer: Kaj Østergaard (DEN)
Dynamo Kyiv – PAOK FC
Referee: Milovan Milačić (MNE)
Assistant Referee 1: Nikola Radulović (MNE)
Assistant Referee 2: Veselin Djuranović (MNE)
Fourth Official: Vladislav Dorosh (UKR)
Referee Observer: Viktor Shvetsov (UKR)
Sheriff Tiraspol – Sogndal Fotball
Referee: Yigal Frid (ISR)
Assistant Referee 1: Sagi Metzamber (ISR)
Assistant Referee 2: Orpaz Hai Hen (ISR)
Fourth Official: Ion Orlic (MDA)
Referee Observer: Igor Șațchii (MDA)
Real Zaragoza – Apoel FC
Referee: Julian Weinberger (AUT)
Assistant Referee 1: Stefan Pichler (AUT)
Assistant Referee 2: Michael Obritzberger (AUT)
Fourth Official: Sergio Usón Rosel (ESP)
Referee Observer: David Fernández Borbalán (ESP)
Stade Rennais – Maccabi Petah Tikva
Referee: Genc Nuza (KVX)
Assistant Referee 1: Fatlum Berisha (KVX)
Assistant Referee 2: Bujar Selimaj (KVX)
Fourth Official: Benjamin Lepaysant (FRA)
Referee Observer: Bertrand Layec (FRA)
IA Akranes – Derby County
Referee: Lionel Tschudi (SUI)
Assistant Referee 1: Vital Jobin (SUI)
Assistant Referee 2: Matthias Sbrissa (SUI)
Fourth Official: Kristján Ólafs (ISL)
Referee Observer: Thóroddur Hjaltalín (ISL)
Rangers FC – Slovan Bratislava
Referee: Rohit Saggi (NOR)
Assistant Referee 1: Geir Isaksen (NOR)
Assistant Referee 2: Morten Jensen (NOR)
Fourth Official: Steven Reid (SCO)
Referee Observer: Hugh Dallas (SCO)