Match-fixing allegations surrounding seven Cameroon World Cup players have been questioned by the International Centre for Sport Security, reports BBC Sport.
Convicted match-fixer Wilson Raj Perumal, from Singapore, made the claims in German magazine Der Spiegel.
But ICSS director Chris Eaton, Fifa's former head of security, says Perumal has also given some "disinformation".
"I understand he has made other predictions that have not proved accurate," said Eaton.
Cameroon lost all their Group A games, including a 4-0 defeat by Croatia.
In a discussion with Der Spiegel, Perumal correctly forecast the result with Croatia and that a player would be sent off.
ICSS, who work with betting regulators, operators and monitoring agencies to look at sport integrity, revealed there was "no observable suspicious betting on this match".
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