Milla claimed earlier this week that Eto'o had "brought lots to Barcelona and Inter Milan but never anything to the Cameroon team", but Eto'o - who won the Champions League with Inter to add to his two triumphs with Barca in 2006 and 2009 - dubbed Milla "bitter".
"People should respect me and they must shut up, really shut up, because playing in the World Cup quarter-finals is not the same as winning the World Cup,'' he told Canal Plus. "It is always before tournaments that bitter people wake up. What has he [Milla] done? He hasn't won the World Cup... And then you wonder, 'are they my people?'. Are they really my people?''
Eto'o then made the stunning claim that he may not play for his country again and raised questions over whether he would make the trip to South Africa this summer.
"Is it worth me going to the World Cup?" he asked on the sidelines of an exhibition match in Paris. "I've still got some days to think about it but I'll see if my taking part is important because I don't need this in my career."
With four goals in five games at the age of 38 in Italia '90, Milla led Cameroon to the quarter-finals [the first African side to get that far] and is seen as the best African striker of his generation.