Footage apparently from inside the Boca dressing room showed the players groggy and disorientated.
Following hours of uncertainty, the game was finally postponed and re-scheduled for Sunday, 8pm GMT, with the news being announced via the stadium PA system.
Reports on Sunday morning [AEDT] indicated that while South American soccer's governing body (CONMEBOL) had wanted the match to go ahead with a delayed kick-off time, River Plate and Boca Juniors came to a "gentlemen's agreement" not to play on the night.
Police attempted to disperse the unruly River Plate fans but their decision to use tear gas backfired as it sprayed through the broken windows and hit the Boca Juniors players.
River were given a bye into the quarter-finals and Boca were kicked out the competition.
Talk of the match going ahead had increased after a number of delays to the match start, with CONMEBOL doctors originally saying there was no medical reason for postponement.
Former Manchester United, Juventus and Manchester City striker Carlos Tevez was one player affected by the tear gas.
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CONMEBOL executives met with Federation Internationale de Football Association president Gianni Infantino, who came to Buenos Aires to attend the match, for a final call on whether the final should proceed or not.
Boca's Pablo Perez suffered injuries to his arm and eye and could not take part in the game.
He said: "We are not in condition to play".
Boca bus attacked by River Plate fans upon arrival for second leg tie, following a 2-2 draw in the first leg.
Early reports indicated that at least three Boca players were transported to hospital.
The drama unfolded when River Plate fans attacked the Boca team coach, throwing missiles as the vehicle, smashing several windows and injuring the players inside.
CONMEBOL chose to delay kick-off by an hour, despite several Boca players being in an unfit state to play the game, but eventually postponed the game until Sunday. No visiting fans are allowed in the stadium, following a 2013 ban on away fans to stop football related violence in Argentina.
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