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A video appears to show Samuel Eto'o lashing out at a man after a game.
Eto'o got into an altercation with another man with a video camera after posing for several pictures with his supporters.
The footage shows Eto'o moving towards the man before he was restrained by bystanders, but the 41-year-old broke free and appeared to hit the man with his knee.
The four-time African Footballer of the Year is an ambassador for the Supreme Committee for Delivery and Legacy which is in charge of the World Cup.
The Supreme Committee has been contacted.
Eto'o was elected president of Fecafoot in December of last year.
He played at Real Madrid and Mallorca.
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