"El Cholo" will be fielding the same team that defeated Boca Juniors last week, with the exception of Sebastian Abreu (his transfer hasn't gone through yet). Therefore, the following eleven will be playing from the first minute:
Paulo Ferrari-Eduardo Tuzzio-Gustavo Cabral-Cristian Villagra;
Oscar Ahumada-Matias Abelairas;
Mauro Rosales-Ariel Ortega-Alexis Sanchez;
Radamel Falcao Garcia
Keep in mind that although this will be the starting team tomorrow, there is no promise that they will continue being on the first team throughout the season: Ponzio and Gerlo will not be playing due to being suspended, Abreu's transfer hasn't gone through, Omar Merlo (defender from Colon) was just recently incorporated, and others such as Augusto Fernandez, Archubi, Nasuti, etc. will continue fighting for a spot.
Gimnasia (JJ), meanwhile, will be presenting a very conservative 3-5-1-1 (only one attacking midfielder and one foward). Unless a last-minute surprise is planned by the coach of "el lobo", River will have to rely heavily on Ortega and Sanchez's creativeness to get through their defensive scheme.
The match will be shown live on TyC Sports USA at 1:30 PM Pacific / 4:30 PM Eastern Time.