Conmebol referee appointments for the upcoming Copa Libertadores and Copa Sul-Americana quarterfinal first legs place Venezuelan official Jesús Valenzuela in charge of Palmeiras against LDU, according to official tournament announcements released Thursday.
Copa Libertadores Quarterfinal Referee Assignments
Uruguayan official Andrés Matonte will handle Fluminense against Platense, with assistance from Andrés Cunha, according to Metrópoles reporting. Palmeiras versus LDU will be overseen by Jesús Valenzuela of Venezuela, assisted by Juan Soto. Estudiantes will face Corinthians under the supervision of Uruguayan referee Esteban Ostojich alongside Antonio García. Finally, the clash between Independiente del Valle and Flamengo falls to Argentine referee Facundo Tello, supported by Silvio Trucco.
Copa Sul-Americana Quarterfinal Officiating Crew
Unlike the top-tier tournament, the secondary continental competition features a lone Brazilian referee among its assignments, according to tournament documents.
Wilton Pereira Sampaio represents Brazil in the middle for the matchup between Cienciano and Montevideo City Torque, working alongside assistant Pablo Gonçalves, according to Metrópoles. Other Sul-Americana fixtures feature Dario Herrera of Argentina for Santa Fe against Vasco da Gama, with Hernan Mastrangelo running the line. Piero Maza of Chile takes charge of Boca Juniors versus São Paulo, assisted by Fernando Vejar. Alexis Herrera of Venezuela referees Santos against Atlético-MG, with Carlos Orbe of Chile assisting.
Pro Tip: Tournament rules dictate that first-leg matches run from September 8 to September 10, while the return legs take place between September 15 and September 17, as reported by Metrópoles.
Tournament Timeline and Final Stages
The Copa Sul-Americana final is set for November 21 at the Estádio Metropolitano Roberto Meléndez in Barranquilla, Colombia. One week later, the Copa Libertadores concludes on November 28 at the Estádio Centenário in Uruguay.

Frequently Asked Questions
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When do the quarterfinal matches take place?
First legs occur between September 8 and September 10, and return legs run from September 15 to September 17, according to Metrópoles. - Are any Brazilian referees officiating in the Copa Libertadores quarterfinals?
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Where is the Copa Libertadores final scheduled?
The match takes place on November 28 at the Estádio Centenário in Uruguay.