Pain became joy when Toronto scored a vital away goal to extend their aggregate lead to 4-1.
Chivas managed to see out the result and will face the winner of the other semifinal, where Toronto FC leads Club America 3-1 on aggregate. Pereira was observed to commit an act of physical aggression against an opponent - grabbing the throat of Red Bulls midfielder Sean Davis - while the ball was not in play.
The second match of the suspension will apply to Pereira's subsequent match in any CONCACAF club championship.
Chivas dispatched of the Seattle Sounders in the quarterfinals after losing the first leg and held on for dear life Tuesday in New York to earn their way into the final.
The Red Bulls had a 20-1 advantage in shots, and Chivas goalkeeper Rodolfo Cota made eight saves before a crowd of 23,623 that featured plenty of Chivas fans. It was Osorio's third goal of the Champions League.
Toronto hosted the first leg in wins over Tigres in the quarterfinals and America in the semifinals.
Jonathan Osorio scored as Toronto drew Club America 1-1 at the storied L'Estadie Azteca.
In the 28th minute, Derrick Etienne rose above a crowd to get his head on a cross, but the attempt sailed over the crossbar.
In the 18th minute, the Red Bulls had a scoring chance when Daniel Royer slid a pass into the box to the right leg of Kemar Lawrence, who just missed connecting with the pass.
As the game wore on Toronto captain Michael Bradley moved further and further back, helping to shore up TFC's defense. His shot was blocked by Toronto F.C.'s wall.
Andres Uribe finally tied it up for Club America in the second minute of injury time on a penalty kick.
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