18 September 2018
FC Barcelona – PSV Eindhoven
Referee: Anastásios Sidirópoulos (GRE, photo)
Assistant Referee 1: Polychrónis Kostarás (GRE)
Assistant Referee 2: Lázaros Dimitriádis (GRE)
Fourth Official: Damianós Efthymiádis (GRE)
Additional AR 1: Anastásios Papapétrou (GRE)
Additional AR 2: Ioánnis Papadópoulos (GRE)
Referee Observer: Michael Riley (ENG)
Inter Milano – Tottenham Hotspur
Referee: Clément Turpin (FRA)
Assistant Referee 1: Nicolas Danos (FRA)
Assistant Referee 2: Cyril Gringore (FRA)
Fourth Official: Guillaume Debart (FRA)
Additional AR 1: Ruddy Buquet (FRA)
Additional AR 2: Nicolas Rainville (FRA)
Referee Observer: Konrad Plautz (AUT)
Club Brugge – Borussia Dortmund
Referee: Danny Makkelie (NED)
Assistant Referee 1: Mario Diks (NED)
Assistant Referee 2: Hessel Steegstra (NED)
Fourth Official: Jan de Vries (NED)
Additional AR 1: Kevin Blom (NED)
Additional AR 2: Jochem Kamphuis (NED)
Referee Observer: Levan Paniashvili (GEO)
AS Monaco – Atlético de Madrid
Referee: William Collum (SCO)
Assistant Referee 1: David McGeachie (SCO)
Assistant Referee 2: Graeme Stewart (SCO)
Fourth Official: Douglas Potter (SCO)
Additional AR 1: Andrew Dallas (SCO)
Additional AR 2: Nicolas Walsh (SCO)
Referee Observer: Kaj Østergaard (DEN)
Liverpool FC – Paris St. Germain
Referee: Cüneyt Çakır (TUR)
Assistant Referee 1: Bahattin Duran (TUR)
Assistant Referee 2: Tarık Ongun (TUR)
Fourth Official: Mustafa Eyisoy (TUR)
Additional AR 1: Hüseyin Göçek (TUR)
Additional AR 2: Barış Şimşek (TUR)
Referee Observer: Miroslav Liba (CZE)
Crvena Zvezda – SSC Napoli
Referee: Szymon Marciniak (POL)
Assistant Referee 1: Paweł Sokolnicki (POL)
Assistant Referee 2: Tomasz Listkiewicz (POL)
Fourth Official: Radosław Siejka (POL)
Additional AR 1: Paweł Raczkowski (POL)
Additional AR 2: Tomasz Musiał (POL)
Referee Observer: Sándor Piller (HUN)
Galatasaray – Lokomotiv Moskva
Referee: Gianluca Rocchi (ITA)
Assistant Referee 1: Mauro Tonolini (ITA)
Assistant Referee 2: Filippo Meli (ITA)
Fourth Official: Matteo Passeri (ITA)
Additional AR 1: Luca Banti (ITA)
Additional AR 2: Massimiliano Irrati (ITA)
Referee Observer: Vladimir Antonov (MDA)
FC Schalke – FC Porto
Referee: Jesús Gil Manzano (ESP)
Assistant Referee 1: Ángel Nevado Rodríguez (ESP)
Assistant Referee 2: Diego Barbero Sevilla (ESP)
Fourth Official: Javier Martínez Nicolás (ESP)
Additional AR 1: Ricardo de Burgos Bengoetxea (ESP)
Additional AR 2: José Munuera Montero (ESP)
Referee Observer: Frank De Bleeckere (BEL)
19 September 2018
AFC Ajax – AEK Athens
Referee: Carlos del Cerro Grande (ESP)
Assistant Referee 1: Juan Carlos Yusté Jiménez (ESP)
Assistant Referee 2: Roberto Alonso Fernández (ESP)
Fourth Official: Abrahám Álvarez Cantón (ESP)
Additional AR 1: Juan Martínez Munuera (ESP)
Additional AR 2: Santiago Jaime Latre (ESP)
Referee Observer: Luciano Luci (ITA)
Shakhtar Donetsk – TSG Hoffenheim
Referee: Jakob Kehlet (DEN)
Assistant Referee 1: Lars Hummelgaard (DEN)
Assistant Referee 2: Heine Sørensen (DEN)
Fourth Official: Niels Brixen (DEN)
Additional AR 1: Michael Tykgaard (DEN)
Additional AR 2: Jens Maae (DEN)
Referee Observer: Bertrand Layec (FRA)
SL Benfica – Bayern München
Referee: Antonio Mateu Lahoz (ESP)
Assistant Referee 1: Pau Cebrián Devís (ESP)
Assistant Referee 2: Roberto Díaz Pérez (ESP)
Fourth Official: Teodoro Sobrino Magán (ESP)
Additional AR 1: Xavier Estrada Fernández (ESP)
Additional AR 2: Alejandro Hernández Hernández (ESP)
Referee Observer: Emil Božinovski (MKD)
Manchester City – Olympique Lyonnais
Referee: Daniele Orsato (ITA)
Assistant Referee 1: Lorenzo Manganelli (ITA)
Assistant Referee 2: Fabiano Preti (ITA)
Fourth Official: Giorgio Peretti (ITA)
Additional AR 1: Marco Guida (ITA)
Additional AR 2: Daniele Doveri (ITA)
Referee Observer: Rune Pedersen (NOR)
Real Madrid – AS Roma
Referee: Björn Kuipers (NED)
Assistant Referee 1: Sander van Roekel (NED)
Assistant Referee 2: Erwin Zeinstra (NED)
Fourth Official: Joost van Zuilen (NED)
Additional AR 1: Dennis Higler (NED)
Additional AR 2: Pol van Boekel (NED)
Referee Observer: Marcel Vanelshocht (BEL)
Viktoria Plzeň – CSKA Moskva
Referee: Benoît Bastien (FRA)
Assistant Referee 1: Hicham Zakrani (FRA)
Assistant Referee 2: Frédéric Haquette (FRA)
Fourth Official: Julien Pacelli (FRA)
Additional AR 1: Benoît Millot (FRA)
Additional AR 2: Jérôme Miguelgorry (FRA)
Referee Observer: Eugen Strigel (GER)
BSC Young Boys – Manchester United
Referee: Deniz Aytekin (GER)
Assistant Referee 1: Eduard Beitinger (GER)
Assistant Referee 2: Rafael Foltyn (GER)
Fourth Official: Dominik Schaal (GER)
Additional AR 1: Tobias Welz (GER)
Additional AR 2: Benjamin Cortus (GER)
Referee Observer: Kaj Natri (FIN)
Valencia – Juventus
Referee: Felix Brych (GER)
Assistant Referee 1: Mark Borsch (GER)
Assistant Referee 2: Stefan Lupp (GER)
Fourth Official: Markus Häcker (GER)
Additional AR 1: Bastian Dankert (GER)
Additional AR 2: Marco Fritz (GER)
Referee Observer: Francesco Bianchi (SUI)