Nigeria have been given until Friday to sort out a legal quagmire involving the country's football federation (NFF) in what FIFA described as a "last opportunity to avoid a lengthy suspension".
FIFA said that if a federal court order, which has declared recent NFF elections to be null and void, is not withdrawn by then, Nigeria will be suspended from international football at least until the end of May.
This in turn would mean that African champions Nigeria, who reached the last-16 stage of this year's World Cup, would not be able to defend their title at the Nations Cup in Morocco in January and February.
The Jos High Court ruled last Thursday that September's NFF vote, which elected Amaju Pinnick as president, be declared null and void, throwing the country's football authorities back into crisis.
"We can confirm that FIFA has been informed by the NFF about the order granted by the Federal High Court nullifying the NFF elections... and that some persons claiming to have been legitimately elected previously went to occupy the offices of the NFF," said FIFA in a statement.
"We also have been informed that security forces prevented the NFF president from travelling to Namibia where he was supposed to represent the NFF at the final match of the African Women's Championship."