25-26 July 2017FK Vardar (MKD) - FC København (DEN)
Referee: Daniel Siebert (GER, photo)
Assistant Referee 1: Jan Seidel (GER)
Assistant Referee 2: Lasse Koslowski (GER)
Fourth Official: Martin Petersen (GER)
Referee Observer: Guy Goethals (BEL)
FK Qarabağ Ağdam (AZE) - FC Sheriff (MDA)
Referee: Siarhei Tsynkevich (BLR)
Assistant Referee 1: Yauheni Ramanau (BLR)
Assistant Referee 2: Vitali Maliutsin (BLR)
Fourth Official: Viktar Shymusik (BLR)
Referee Observer: Ichko Lozev (BUL)
SK Slavia Praha (CZE) - FC BATE Borisov (BLR)
Referee: Bastian Dankert (GER)
Assistant Referee 1: Mike Pickel (GER)
Assistant Referee 2: Christian Gittelmann (GER)
Fourth Official: Harm Osmers (GER)
Referee Observer: Yuri Baskakov (RUS)
AEK Athens FC (GRE) - PFC CSKA Moskva (RUS)
Referee: Marco Fritz (GER)
Assistant Referee 1: Holger Henschel (GER)
Assistant Referee 2: Arno Blos (GER)
Fourth Official: Sven Jablonski (GER)
Referee Observer: Francesco Bianchi (SUI)
Fotbal Club FCSB (ROU) - FC Viktoria Plzeň (CZE)
Referee: Aliyar Aghayev (AZE)
Assistant Referee 1: Zeynal Zeynalov (AZE)
Assistant Referee 2: Rza Mammadov (AZE)
Fourth Official: Orkhan Mammadov (AZE)
Referee Observer: Fritz Stuchlik (AUT)
FK Partizan (SRB) - Olympiacos FC (GRE)
Referee: Davide Massa (ITA)
Assistant Referee 1: Filippo Meli (ITA)
Assistant Referee 2: Gianluca Vuoto (ITA)
Fourth Official: Gianpaolo Calvarese (ITA)
Referee Observer: Sergey Zuev (RUS)
FC Astana (KAZ) - Legia Warszawa (POL)
Referee: Tamás Bognár (HUN)
Assistant Referee 1: Balázs Buzás (HUN)
Assistant Referee 2: Theodoros Georgiou (HUN)
Fourth Official: Csaba Pintér (HUN)
Referee Observer: Martin Ingvarsson (SWE)
FC Dynamo Kyiv (UKR) - BSC Young Boys (SUI)
Referee: Andreas Ekberg (SWE)
Assistant Referee 1: Mehmet Culum (SWE)
Assistant Referee 2: Stefan Hallberg (SWE)
Fourth Official: Kristoffer Karlsson (SWE)
Referee Observer: William Young (SCO)
FC Salzburg (AUT) - HNK Rijeka (CRO)
Referee: Daniel Stefanski (POL)
Assistant Referee 1: Marcin Boniek (POL)
Assistant Referee 2: Dawid Igor Golis (POL)
Fourth Official: Zbigniew Dobrynin (POL)
Referee Observer: Murat Ilgaz (TUR)
Hapoel Beer-Sheva FC (ISR) - PFC Ludogorets 1945 (BUL)
Referee: Charalampos Kalogeropoulos (GRE)
Assistant Referee 1: Damianos Efthymiadis (GRE)
Assistant Referee 2: Tryfon Petropoulos (GRE)
Fourth Official: Georgios Kominis (GRE)
Referee Observer: Eugen Strigel (GER)
Fotbal Club Viitorul (ROU) - APOEL FC (CYP)
Referee: Paolo Valeri (ITA)
Assistant Referee 1: Alessandro Giallatini (ITA)
Assistant Referee 2: Alfonso Marrazzo (ITA)
Fourth Official: Daniele Doveri (ITA)
Referee Observer: Rodger Gifford (WAL)
NK Maribor (SVN) - FH Hafnarfjörður (ISL)
Referee: Andris Treimanis (LVA)
Assistant Referee 1: Haralds Gudermanis (LVA)
Assistant Referee 2: Aleksejs Spasjonnikovs (LVA)
Fourth Official: Aleksandrs Golubevs (LVA)
Referee Observer: Alfredo Trentalange (ITA)
OGC Nice (FRA) - AFC Ajax (NED)
Referee: Carlos Del Cerro Grande (ESP)
Assistant Referee 1: Juan Yuste Jiménez (ESP)
Assistant Referee 2: Abrahám Álvarez Cantón (ESP)
Fourth Official: José Sánchez Martínez (ESP)
Referee Observer: Georgios Bikas (GRE)
Celtic FC (SCO) - Rosenborg BK (NOR)
Referee: Tiago Martins (POR)
Assistant Referee 1: Luis Campos (POR)
Assistant Referee 2: Rui Teixeira (POR)
Fourth Official: Bruno Esteves (POR)
Referee Observer: Alain Hamer (LUX)
Club Brugge KV (BEL) - İstanbul Başakşehir FK (TUR)
Referee: Paolo Mazzoleni (ITA)
Assistant Referee 1: Fabiano Preti (ITA)
Assistant Referee 2: Giacomo Paganessi (ITA)
Fourth Official: Luca Pairetto (ITA)
Referee Observer: Kaj Østergaard (DEN)