Security forces have sealed off the main office of the crisis-hit Nigerian Football Federation in the capital Abjua.
Soldiers and riot police are manning the entrance of the building.
It follows last week's court ruling that NFF president Amaju Pinnick lost his post to Chris Giwa in elections in September 2014.
Giwa and his team have since occupied the NFF offices and have said they would start work on Monday.
The NFF has appealed against the court ruling, insisting that Pinnick is still the head of the federation.
It is not clear why police have taken control of the building.
Nigeria now face the prospect of a Fifa ban, which could put their World Cup qualification hopes in jeopardy.
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