He lay for two days with severe head injuries in hospital, where doctors declared him brain dead.

The club announced his death in a statement on Monday.

The Argentine Football Association called for "those responsible for this inconceivable assault" to be brought to justice.

It called in a statement for "the necessary measures so that incidents like this do not happen again in any Argentine football stadium."

Police commissioner Jorge Gomez said two people were arrested on Sunday and two more early Monday over the attack.