Cameroon may not be able to wear their controversial new kit for the African Cup of Nations which starts in Tunisia on Saturday.
Cameroon's Samuel Eto Fils models the new strip
Fifa President Sepp Blatter says the new all-in-one red and green bodysuit contravenes the rules of the game.
He told BBC Sport in Tunisia that Fifa would be forced to intervene if Cameroon wear the kit for their opening match against Algeria on Sunday.
"It goes against the laws of the game," Blatter said.
According to the Fifa rules teams are required to wear both shorts and a shirt.
Blatter said the new kit did not meet those requirements.
"The rules are very clear, there is one shirt, one shorts and one socks," Blatter reiterated.
"They cannot do it. You cannot play a game against the laws of the game.
"We are the guardians of the laws of the game - the laws are universal."
Asked whether a decision on the kit was a matter for Caf or for Fifa Blatter replied: "We have to intervene."
Caf President Issa Hayatou told BBC Sport that he was due to meet the management of the Cameroon team on Friday night to discuss the issue further.
Cameroon ran into trouble with Fifa two years ago with the kit they used for the Cup of Nations.
They opted for a sleeveless shirt, which also contravenes Fifa rules.
It meant that they had to have a new kit made for the World Cup in Japan and South Korea in the same year.
Their kit suppliers Puma say they had approval from the Caf executive for the latest kit.
"Caf did not see it as contradictory to the laws," Puma's
soccer marketing official, Filip Trulsson said.
He said if Fifa takes steps against the bodysuit, Puma
had little option but to go along.
"We have no interest in doing something against the good
of the game," he said.
"If Fifa decides it is not for the good of the game, we would have to look at it."