CONMEBOL Libertadores 2021 – Quarter-finals (First Leg)

10-12 August 2021

Sao Paulo – Palmeiras
Referee: Nestor Pitana (ARG, photo)
Assistant Referee 1: Ezequiel Brailovsky (ARG)
Assistant Referee 2: Gabriel Chade (ARG)
Fourth Official: Guillermo Guerrero (ECU)
VAR: Julio Bascunan (CHI)
AVAR 1: Victor Carrillo (PER)
AVAR 2: Christian Lescano (ECU)
Referee Assessor: Regildenia Moura (BRA)
VAR Observer: Ubaldo Aquino (PAR)

Olimpia – Flamengo
Referee: Fernando Rapallini (ARG)
Assistant Referee 1: Juan Belatti (ARG)
Assistant Referee 2: Diego Bonfa (ARG)
Fourth Official: Dario Herrera (ARG)
VAR: Mauro Vigliano (ARG)
AVAR 1: German Delfino (ARG)
AVAR 2: Raul Orellana (CHI)
Referee Assessor: Amelio Andino (PAR)
VAR Observer: Hector Baldassi (ARG)

River Plate – Atletico Mineiro
Referee: Jesus Valenzuela (VEN)
Assistant Referee 1: Tulio Moreno (VEN)
Assistant Referee 2: Lubin Torrealba (VEN)
Fourth Official: Angelo Hermosilla (CHI)
VAR: John Ospina (COL)
AVAR 1: Cristian Garay (CHI)
AVAR 2: Alexander Guzman (COL)
Referee Assessor: Angel Sanchez (ARG)
VAR Observer: Enrique Caceres (PAR)

Fluminense – Barcelona
Referee: Alexis Herrera (VEN)
Assistant Referee 1: Carlos Lopez (VEN)
Assistant Referee 2: Jorge Urrego (VEN)
Fourth Official: Yender Herrera (VEN)
VAR: Andres Cunha (URU)
AVAR 1: Juan Soto (VEN)
AVAR 2: John Leon (COL)
Referee Assessor: Sergio Cristiano (BRA)
VAR Observer: Dario Ubriaco (URU)