First Leg, 22 November 2017 Gremio – Lanus Referee: Julio Bascunan (CHI, photo) Assistant Referee 1: Carlos Astroza (CHI) Assistant Referee 2: Christian Schiemann (CHI) Fourth Official: Diego Haro (PER) VAR 1: Jesus Valenzuela (VEN) VAR 2: Christian Lescano (ECU) AVAR: Roddy Zambrano (ECU) Referee Assessor: Carlos Torres (PAR) Referees Committee: Wilson Seneme (BRA)
Second Leg, 29 November 2017
Lanus – Gremio Referee: Enrique Caceres (PAR) Assistant Referee 1: Eduardo Cardozo (PAR) Assistant Referee 2: Juan Zorrilla (PAR) Fourth Official: Eber Aquino (PAR) VAR 1: Mario Diaz de Vivar (PAR) VAR 2: Milciades Saldivar (PAR) AVAR: Victor Carrillo (PER) Referee Assessor: Hector Baldassi (ARG) Referees Committee: Wilson Seneme (BRA)