16 August 2016
Steaua Bucureşti – Manchester City
Referee: Daniele Orsato (ITA, photo)
Assistant Referee 1: Riccardo Di Fiore (ITA)
Assistant Referee 2: Lorenzo Manganelli (ITA)
Additional AR 1: Paolo Mazzoleni (ITA)
Additional AR 2: Carmine Russo (ITA)
Fourth Official: Matteo Passeri (ITA)
Referee Observer: Zbigniew Przesmycki (POL)
FC Kobenhavn – Apoel Nicosia
Referee: Pavel Královec (CZE)
Assistant Referee 1: Roman Slyško (SVK)
Assistant Referee 2: Ivo Nadvorník (CZE)
Additional AR 1: Petr Ardeleanu (CZE)
Additional AR 2: Karel Hrubeš (CZE)
Fourth Official: Tomas Mokrusch (CZE)
Referee Observer: Sándor Piller (HUN)
AFC Ajax – FC Rostov
Referee: William Collum (SCO)
Assistant Referee 1: Francis Connor (SCO)
Assistant Referee 2: Douglas Ross (SCO)
Additional AR 1: Bobby Madden (SCO)
Additional AR 2: John Beaton (SCO)
Fourth Official: Alastair Mather (SCO)
Referee Observer: Juan Fernández Marín (ESP)
Dinamo Zagreb – FC Salzburg
Referee: Anastasios Sidiropoulos (GRE)
Assistant Referee 1: Damianos Efthimiadis (GRE)
Assistant Referee 2: Polychronis Kostaras (GRE)
Additional AR 1: Charambalos Kalogeropoulos (GRE)
Additional AR 2: Alexandros Aretopoulos (GRE)
Fourth Official: Lazaros Dimitriadis (GRE)
Referee Observer: Francesco Bianchi (SUI)
Young Boys – Borussia Mönchengladbach
Referee: Nicola Rizzoli (ITA)
Assistant Referee 1: Elenito Di Liberatore (ITA)
Assistant Referee 2: Mauro Tonolini (ITA)
Additional AR 1: Antonio Damato (ITA)
Additional AR 2: Massimiliano Irrati (ITA)
Fourth Official: Filippo Meli (ITA)
Referee Observer: Peter Jones (ENG)
17 August 2016
Ludogorets Razgrad – Viktoria Plzeň
Referee: Mark Clattenburg (ENG)
Assistant Referee 1: Jake Collin (ENG)
Assistant Referee 2: Simon Bennett (ENG)
Additional AR 1: Andre Marriner (ENG)
Additional AR 2: Lee Mason (ENG)
Fourth Official: Adam Nunn (ENG)
Referee Observer: Guy Goethals (BEL)
Celtic FC – Hapoel Beer Sheva
Referee: Damir Skomina (SVN)
Assistant Referee 1: Jure Praprotnik (SVN)
Assistant Referee 2: Robert Vukan (SVN)
Additional AR 1: Matej Jug (SVN)
Additional AR 2: Dragoslav Peric (SVN)
Fourth Official: Tomaz Klancnik (SVN)
Referee Observer: Fritz Stuchlik (AUT)
FC Porto – AS Roma
Referee: Björn Kuipers (NED)
Assistant Referee 1: Sander van Roekel (NED)
Assistant Referee 2: Erwin Zeinstra (NED)
Additional AR 1: Pol van Boekel (NED)
Additional AR 2: Richard Liesveld (NED)
Fourth Official: Charles Schaap (NED)
Referee Observer: William Young (SCO)
Dundalk FC – Legia Warszawa
Referee: Deniz Aytekin (GER)
Assistant Referee 1: Guido Kleve (GER)
Assistant Referee 2: Markus Häcker (GER)
Additional AR 1: Tobias Welz (GER)
Additional AR 2: Benjamin Brand (GER)
Fourth Official: Jan Seidel (GER)
Referee Observer: Rodger Gifford (WAL)
Villarreal CF – AS Monaco
Referee: Felix Brych (GER)
Assistant Referee 1: Mark Borsch (GER)
Assistant Referee 2: Marco Achmüller (GER)
Additional AR 1: Marco Fritz (GER)
Additional AR 2: Robert Hartmann (GER)
Fourth Official: Rafael Foltyn (GER)
Referee Observer: Kaj Natri (FIN)