Arsenal – Atletico de Madrid Referee: Clement Turpin (FRA, photo) Assistant Referee 1: Nicolas Danos (FRA) Assistant Referee 2: Cyril Gringore (FRA) Additional AR 1: Ruddy Buquet (FRA) Additional AR 2: Nicolas Rainville (FRA) Fourth Official: Hicham Zakrani (FRA) Referee Observer: Matteo Trefoloni (ITA)
Olympique de Marseille – FC Salzburg Referee: William Collum (SCO) Assistant Referee 1: David McGeachie (SCO) Assistant Referee 2: Francis Connor (SCO) Additional AR 1: Robert Madden (SCO) Additional AR 2: John Beaton (SCO) Fourth Official: Douglas Potter (SCO) Referee Observer: Nikolai Levnikov (RUS)
26 April 2018