BRASÍLIA — The plight of African teams at the World Cup has not subsided even after they all have been eliminated. Cameroon’s soccer federation announced late Monday that it would investigate its team for possible match fixing, paying particular attention to a lopsided loss to Croatia in the opening round.

The federation, which has long been at odds with its players over a payment dispute, began the investigation on its own after the German newsmagazine Der Spiegel noted that a notorious match-fixer, Wilson Raj Perumal, had accurately predicted both the 4-0 score and the first-half ejection of a Cameroon player on his Facebook page.

“Recent allegations of fraud around Cameroon 2014 FIFA World Cup three preliminary games, especially Cameroon vs. Croatia, as well of the ‘existence of seven bad apples’ ” on the Cameroon team, “do not reflect the values and principles promoted by our administration,” the Cameroon’s federation, known as Fecafoot, said in a statement posted on its website.

But on Monday, Perumal issued a denial in The Telegraph of Britain that he had ever predicted the score or the red card, casting doubt on the basis for the investigation.