CONMEBOL rejected Gremio's appeal, confirming a Superclasico Copa Libertadores final.
Gremio have been given hope in their appeal against Copa Libertadores elimination after CONMEBOL refused to confirm River Plate's passage.
Marcelo Gallardo admitted to visiting the River Plate dressing room despite a suspension from CONMEBOL and Gremio plan to take action.
Suggestions Marcelo Gallardo gave directions to the River Plate players despite a ban have been denied by Javier Pinola.
River Plate's first goal should have been disallowed by VAR, according to Gremio boss Renato Gaucho.
Gonzalo Martinez's stoppage-time penalty saw River Plate past Gremio and into the Copa Libertadores final.
A second-half header from Michel was enough for Gremio to edge River Plate 1-0 in the Copa Libertadores.
River Plate and Gremio will meet in the final four after respective wins against Independiente and Atletico Tucuman.
Gremio travelled to Argentina and drew first blood in the opening leg of their quarter-final tie thanks to Alisson and Everton.
Independiente were awarded a 3-0 victory just hours before Tuesday's return fixture after Santos fielded an ineligible player.