Boca Juniors supporters cheer during a gathering outside the team hotel in Madrid. The Copa Libertadores Final between River Plate and Boca Juniors will be played on Dec. 9 in Madrid, Spain, at Real Madrid's stadium. Photo: Manu Fernandez/AP Photo

MADRID The Copa Libertadores final second leg between Argentinian giants River Plate and Boca Juniors will take place in Madrid on Sunday after the Court of Arbitration for Sport (CAS) rejected a late request by Boca.

With the tie at 2-2 from the first leg, last month's second leg at River's Monumental stadium in Buenos Aires was postponed after River fans pelted the Boca team bus with stones, injuring some players.

The game was eventually rescheduled for Madrid to avoid further fan violence but River objected at losing their home advantage. South American federation CONMEBOL rejected their complaints.

Boca meanwhile wanted River to be thrown of the competition, South America's equivalent of the Champions League, and made a late application to CAS after CONMEBOL had said no.

CAS said in a statement it had "dismissed an urgent request for provisional measures" filed by Boca with regards to the match at Real Madrid's Bernabeu stadium being postponed, but left the door open for River to be disqualified following the second leg.

"The merits of the appeal will be examined at a later stage by a CAS arbitral panel. The arbitration procedure is on-going with the exchange of written submissions," CAS added.

The winner of the Copa Libertadores will represent South America in the coming Club World Cup which begins December 12 in the United Arab Emirates. River or Boca, however, would enter the competition with a semi-final on December 18.