The decisive second leg of the Copa Libertadores final between River Plate and Boca Juniors was delayed an hour on Saturday after Boca players were hurt when their bus was attacked on its way into the stadium, organisers said.
"Due to the incidents with the Boca Juniors team bus, the game has been back an hour until 18:00," the South American Football Confederation (CONMEBOL) said.
Some reports said Argentine police fired tear gas at River fans who were throwing missiles at the Boca bus and the gas got into the vehicle.
Others reported that the damage was caused by River fans.
"They were throwing pepper gas, stones, everything," Clarin website quoted Juan Carlos Crespi, a member of the Boca delegation, as saying.
Boca officials told reporters some of their players were not fit to play in the match.
"The players are all hurt, you can't play this way," Christian Gribaudo, Boca's secretary general, said.
Clarin said six players had vomited in the dressing-room after gas drifted into bus windows smashed by River fans outside the stadium.
Boca and River drew the first leg 2-2 on Nov. 11.
The incident occurred three years after a Copa Libertadores last-16 tie between the same teams was abandoned at halftime after Boca fans attacked the River players with pepper spray in the tunnel.
River were given a bye into the quarter-finals and Boca were kicked out the competition.
