CONMEBOL Libertadores 2019 – Semi-finals (First Leg)

1-2 October 2019

River Plate – Boca Juniors
Referee: Raphael Claus (BRA, photo)
Assistant Referee 1: Danilo Manis (BRA)
Assistant Referee 2: Bruno Pires (BRA)
Fourth Official: Arnaldo Samaniego (PAR)
VAR: Nicolas Gallo (COL)
AVAR 1: Rodolpho Toski (BRA)
AVAR 2: Emerson de Carvalho (BRA)
VAR Observer: Patricio Polic (CHI)
Referee Assessor: Dario Ubriaco (URU)

Gremio – Flamengo
Referee: Nestor Pitana (ARG)
Assistant Referee 1: Juan Belatti (ARG)
Assistant Referee 2: Hernan Maidana (ARG)
Fourth Official: Guillermo Guerrero (ECU)
VAR: Mauro Vigliano (ARG)
AVAR 1: German Delfino (ARG)
AVAR 2: Ezequiel Brailovsky (ARG)
VAR Observer: Enrique Caceres (PAR)
Referee Assessor: Martin Vazquez (URU)