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Song had received a red card in the first half after elbowing Mandzukic in the back and was sent off by Portuguese referee Pedro Proenca, reports EFE.
Croatia had already scored one goal in the first half before scoring three more in the second half to end the game 4-0 and finish off Cameroon's World Cup campaign.
Song was also fined 16,500 euros and will miss his country's upcoming game against Brazil Monday at the Estadio Nacional in Brasilia along with the first two international games for Cameroon after the World Cup.
IANS/EFE