22 August 2017
Nice – Napoli
Referee: Damir Skomina (SVN, photo)
Assistant Referee 1: Jure Praprotnik (SVN)
Assistant Referee 2: Robert Vukan (SVN)
Additional AR 1: Matej Jug (SVN)
Additional AR 2: Slavko Vinčić (SVN)
Fourth Official: Tomaž Klančnik (SVN)
Referee Observer: Levan Paniashvili (GEO)
Astana – Celtic
Referee: Pavel Královec (CZE)
Assistant Referee 1: Roman Slyško (SVK)
Assistant Referee 2: Ivo Nádvorník (CZE)
Additional AR 1: Petr Ardeleánu (CZE)
Additional AR 2: Karel Hrubeš (CZE)
Fourth Official: Martin Wilczek (CZE)
Referee Observer: Neale Barry (ENG)
Sevilla FC – İstanbul Başakşehir
Referee: William Collum (SCO)
Assistant Referee 1: David McGeachie (SCO)
Assistant Referee 2: Francis Connoer (SCO)
Additional AR 1: Robert Madden (SCO)
Additional AR 2: John Beaton (SCO)
Fourth Official: Graeme Stewart (SCO)
Referee Observer: Carmel Agius (MLT)
NK Maribor – Hapoel Beer Sheva
Referee: Gianluca Rocchi (ITA)
Assistant Referee 1: Elenito Di Liberatore (ITA)
Assistant Referee 2: Mauro Tonolini (ITA)
Additional AR 1: Paolo Valeri (ITA)
Additional AR 2: Daniele Doveri (ITA)
Fourth Official: Alessandro Giallatini (ITA)
Referee Observer: Mehmet Ilgaz (TUR)
HNK Rijeka – Olympiacos
Referee: Danny Makkelie (NED)
Assistant Referee 1: Mario Diks (NED)
Assistant Referee 2: Hessel Steegstra (NED)
Additional AR 1: Kevin Blom (NED)
Additional AR 2: Jochem Kamphuis (NED)
Fourth Official: Bas van Dongen (NED)
Referee Observer: William Young (SCO)
23 August 2017
FC Kobenhavn – Qarabağ Ağdam
Referee: Alberto Undiano Mallenco (ESP)
Assistant Referee 1: Roberto Alonso Fernández (ESP)
Assistant Referee 2: Raúl Cabañero Martínez (ESP)
Additional AR 1: Alejandro Hernández Hernández (ESP)
Additional AR 2: José Sánchez Martínez (ESP)
Fourth Official: Diego Barbero Sevilla (ESP)
Referee Observer: Alfredo Trentalange (ITA)
Steaua – Sporting
Referee: Cüneyt Çakır (TUR)
Assistant Referee 1: Bahattin Duran (TUR)
Assistant Referee 2: Tarik Ongun (TUR)
Additional AR 1: Hüseyin Göçek (TUR)
Additional AR 2: Baris Şimşek (TUR)
Fourth Official: Esat Sancaktar (TUR)
Referee Observer: Uno Tutk (EST)
Liverpool – Hoffenheim
Referee: Daniele Orsato (ITA)
Assistant Referee 1: Riccardo Di Fiore (ITA)
Assistant Referee 2: Lorenzo Manganelli (ITA)
Additional AR 1: Luca Banti (ITA)
Additional AR 2: Massimiliano Irrati (ITA)
Fourth Official: Andrea Crispo (ITA)
Referee Observer: Bertrand Layec (FRA)
Slavia Praha – Apoel
Referee: Milorad Mažić (SRB)
Assistant Referee 1: Milovan Ristić (SRB)
Assistant Referee 2: Dalibor Djurdjević (SRB)
Additional AR 1: Nenad Djokić (SRB)
Additional AR 2: Danilo Grujić (SRB)
Fourth Official: Nemanja Petrović (SRB)
Referee Observer: Jorn West Larsen (DEN)
CSKA Moskva – Young Boys
Referee: Anastasios Sidiropoulos (GRE)
Assistant Referee 1: Polychronis Kostaras (GRE)
Assistant Referee 2: Lazaros Dimitriadis (GRE)
Additional AR 1: Charalambos Kalogeropoulos (GRE)
Additional AR 2: Alexandros Aretopoulos (GRE)
Fourth Official: Damianos Efthimiadis (GRE)
Referee Observer: Ichko Lozev (BUL)