Siasia, speaking during the weekend, says that NFF is owing him five months' salary: April to August 2016.
"I have given them a two week ultimatum to pay me or I will sit inside the NFF office in Abuja until I get paid,” Siasia told BBC Sport.
"The national team is preparing for a World Cup qualifier and to be honest my unhealthy distractions are the last thing they need right now.
"I’ve made it clear in my letter that my assistants and I should be paid the backlog owed because it’s inhuman.
"As head of our families we sacrificed everything for the country but the NFF refused to pay us – it’s not only heartless but wicked."