Benin coach Reinhard Fabisch said he was approached by a man claiming to be from a Singapore-based company to help fix the result of his side's match against Mali.
He is willing to give the Confederation of African Football the name and number of the man, whom he described as a black African.
'He wanted to find out from me if there was any possibility of manipulating the match,' Fabisch told the BBC. 'I told him: 'Look, you have two minutes to leave the hotel or I will call the police'.'
The man spoke to him last Saturday, two days before Benin lost the Group B match 0-1 after conceding a penalty at the start of the second half.
The man said the company he represented claimed to be able to fix matches across Africa and planned to win money in bets on the tournament's opening goal.
The first goal of the Africa Cup of Nations was Ghana's penalty against Guinea on Jan 20, a game the tournament hosts won 2-1.
Said Fabisch: 'African players are vulnerable to this kind of approach, because many of them don't have money. This is why poor countries like Benin are targeted.'
ASSOCIATED PRESS