ACF Fiorentina – Lech Poznan
Referee: Rade Obrenovič (SVN, photo)
Assistant Referee 1: Jure Praprotnik (SVN)
Assistant Referee 2: Grega Kordež (SVN)
Fourth Official: Slavko Vinčić (SVN)
VAR: Nejc Kajtazović (SVN)
AVAR: Matej Jug (SVN)
Referee Observer: Francesco Bianchi (SUI)
AZ Alkmaar – RSC Anderlecht
Referee: Davide Massa (ITA)
Assistant Referee 1: Filippo Meli (ITA)
Assistant Referee 2: Stefano Alassio (ITA)
Fourth Official: Daniele Chiffi (ITA)
VAR: Marco Di Bello (ITA)
AVAR: Fabio Maresca (ITA)
Referee Observer: Stavros Tritsonis (GRE)
West Ham United – KAA Gent
Referee: Orel Grinfeeld (ISR)
Assistant Referee 1: Roy Hassan (ISR)
Assistant Referee 2: Idan Yarkoni (ISR)
Fourth Official: Gal Leibovitz (ISR)
VAR: Roi Reinshreiber (ISR)
AVAR: Eli Hacmon (ISR)
Referee Observer: Hugh Dallas (SCO)
OGC Nice – FC Basel
Referee: Serdar Gözübüyük (NED)
Assistant Referee 1: Erwin Zeinstra (NED)
Assistant Referee 2: Johan Balder (NED)
Fourth Official: Sander van der Eijk (NED)
VAR: Dennis Higler (NED)
AVAR: Jeroen Manschot (NED)
Referee Observer: Kyros Vassaras (GRE)
