UEFA Youth League – Group Stage (Matchday 1)

12 September 2017
Celtic FC – Paris SG
Referee: Alexander Harkam (AUT, photo)
Assistant Referee 1: Roland Brandner (AUT)
Assistant Referee 2: Stefan Kühr (AUT)
Fourth Official: Barry Cook (SCO)
Referee Observer: Edward Foley (IRL)

SL Benfica – CSKA Moskva

Referee: Petr Ardeleánu (CZE)
Assistant Referee 1: Jakub Hrabovský (CZE)
Assistant Referee 2: Tomáš Mokrusch (CZE)
Fourth Official: Rui Piteira Rodrigues (POR)
Referee Observer: Nuno Castro (POR)

Manchester United – Basel
Referee: Keith Kennedy (NIR)
Assistant Referee 1: Georgios Argyropoulos (NIR)
Assistant Referee 2: Ryan Kelsey (NIR)
Fourth Official: Anthony Backhouse (ENG)
Referee Observer: Patrick Kelly (IRL)

Bayern München – RSC Anderlecht
Referee: Mykola Balakin (UKR)
Assistant Referee 1: Viktor Matyash (UKR)
Assistant Referee 2: Valentyn Kutsev (UKR)
Fourth Official: Florian Badstübner (GER)
Referee Observer: Edgar Steinborn (GER)

Chelsea – Qarabag
Referee: Robert Hennessy (IRL)
Assistant Referee 1: Darragh Keegan (IRL)
Assistant Referee 2: Darren Carey (IRL)
Fourth Official: John Busby (ENG)
Referee Observer: Peter Jones (ENG)

AS Roma – Atlético de Madrid
Referee: Rade Obrenovič (SVN)
Assistant Referee 1: Grega Kordež (SVN)
Assistant Referee 2: Tomislav Pospeh (SVN)
Fourth Official: Alessandro Di Paolo (ITA)
Referee Observer: Matteo Trefoloni (ITA)

FC Barcelona – Juventus

Referee: Mads-Kristoffer Kristoffersen (DEN)
Assistant Referee 1: Henrik Sønderby (DEN)
Assistant Referee 2: Ole Kronlykke (DEN)
Fourth Official: David Medié Jiménez (ESP)
Referee Observer: Luis Medina Cantalejo (ESP)

Olympiakós – Sporting
Referee: Alan Sant (MLT)
Assistant Referee 1: Mitchell Scerri (MLT)
Assistant Referee 2: Duncan Sultana (MLT)
Fourth Official: Aristotelis Diamantopoulos (GRE)
Referee Observer: Stavros Tritsonis (GRE)

13 September 2017
NK Maribor – Spartak Moskva
Referee: Ferenc Karakó (HUN)
Assistant Referee 1: Balázs Szert (HUN)
Assistant Referee 2: Gergő Vígh-Tarsonyi (HUN)
Fourth Official: Marko Lackovič (SVN)
Referee Observer: Darko Čeferin (SVN)

Liverpool – Sevilla

Referee: Thorvaldur Árnason (ISL)
Assistant Referee 1: Birkir Sigurdarson (ISL)
Assistant Referee 2: Andri Vigfússon (ISL)
Fourth Official: Scott Oldham (ENG)
Referee Observer: Brian Lawlor (WAL)

Shakhtar Donetsk – SSC Napoli
Referee: Aleksandrs Anufrijevs (LVA)
Assistant Referee 1: Romāns Platonovs (LVA)
Assistant Referee 2: Aleksejs Griščenko (LVA)
Fourth Official: Vitaliy Romanov (UKR)
Referee Observer: Volodymyr Petrov (UKR)

Feyenoord Rotterdam – Manchester City

Referee: Glenn Nyberg (SWE)
Assistant Referee 1: Fredrik Klyver (SWE)
Assistant Referee 2: Mahbod Beigi (SWE)
Fourth Official: Siemen Mulder (NED)
Referee Observer: Marinus Koopman (NED)

RB Leipzig – AS Monaco
Referee: Krzysztof Jakubik (POL)
Assistant Referee 1: Kamil Wójcik (POL)
Assistant Referee 2: Bartosz Heinig (POL)
Fourth Official: Alexander Sather (GER)
Referee Observer: Helmut Fleischer (GER)

FC Porto – Beşiktaş JK
Referee: Adrien Jaccottet (SUI)
Assistant Referee 1: Vital Jobin (SUI)
Assistant Referee 2: Sertac Kurnazca (SUI)
Fourth Official: João Borlido Matos (POR)
Referee Observer: Lucílio Cardoso (POR)

Real Madrid – Apoel
Referee: Laurent Kopriwa (LUX)
Assistant Referee 1: Claude Ries (LUX)
Assistant Referee 2: Joaquim Da Silva (LUX)
Fourth Official: Valentín Pizarro Gómez (ESP)
Referee Observer: Juan Fernández Marín (ESP)

Tottenham Hotspur – Borussia Dortmund
Referee: Bryn Markham-Jones (WAL)
Assistant Referee 1: Harry Hendricks (WAL)
Assistant Referee 2: Ashley Davis (WAL)
Fourth Official: John Brooks (ENG)
Referee Observer: Gerard Perry (IRL)