Celta de Vigo – SC Freiburg
Referee: Anthony Taylor ENG (photo)
Assistant Referee 1: Gary Bewisk ENG
Assistant Referee 2: Daniel Cook ENG
Fourth Official: Robert Jones ENG
VAR: Jarred Gillett ENG
AVAR: Stuart Attwell ENG
Referee Observer: Andreas Schluchter SUI
Real Betis – SC Braga
Referee: Davide Massa ITA
Assistant Referee 1: Filippo Meli ITA
Assistant Referee 2: Stefano Alassio ITA
Fourth Official: Matteo Marcenaro ITA
VAR: Daniele Chiffi ITA
AVAR: Luca Pairetto ITA
Referee Observer: Lutz-Michael Fröhlich GER
Aston Villa – Bologna FC
Referee: José Sánchez Martinez ESP
Assistant Referee 1: Raúl Cabañero Martinez ESP
Assistant Referee 2: Iñigo Prieto Lopez ESP
Fourth Official: José Munuera Montero ESP
VAR: Carlos Del Cerro Grande ESP
AVAR: César Soto Grado ESP
Referee Observer: Augustus Constantin ROU
Nottingham Forrest – FC Porto
Referee: Danny Makkelie NED
Assistant Referee 1: Hessel Steegstra NED
Assistant Referee 2: Jan de Vries NED
Fourth Official: Allard Lindhout NED
VAR: Ivan Bebek CRO
AVAR: Sören Storks GER
Referee Observer: Nicola Rizzoli ITA