The Barcelona midfielder was dismissed for striking Mario Mandzukic off the ball as Cameroon crashed out of the tournament following a 4-0 loss to Croatia on WednesdayCameroon midfielder Alex Song has apologised to the nation's fans after his red card in Wednesday's defeat to Croatia.
The Barcelona man was sent off for elbowing striker Mario Mandzukic in the back as Volker Finke's men slipped to a second defeat at the World Cup, going down 4-0 in Manuas.
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"I'm very sad at the moment as I feel I have let my country and myself down," he said in a statement.
"It was a stupid moment and I'm truly sorry. If I could do anything to take it back I would. Please forgive me."
Cameroon are now out of the competition and also saw Benoit Assou-Ekotto involved in an unsavoury tangle with team-mate Benjamin Moukandjo late on, an incident coach Volker Finke described as "unimaginable".
"I saw this happen and I need to find out exactly what happened, why exactly these two players exploded. I hate to see that. It's not the image of Cameroon I want to project."
Cameroon will seek to restore some pride when they face hosts Brazil in the final game of their campaign.