Newcastle owner Mike Ashley has told potential buyers that they must declare their intentions for buying the club by Tuesday, according to BBC Sport. The takeover from businessmen from America, Asia or the Middle East could be completed by mid-November should buyers emerge on 7 October.
BBC Sport's Garry Richardson said on Radio 5 Live's Sportsweek programme: "It's hoped that Tuesday will be a significant day in the sale of the club.
"Interested parties who wish to buy Newcastle have been asked to make their intention clear by Tuesday as to whether they intend to make a serious bid for the club."
Richardson added: "I have been told that there is no interest from Nigeria or South Africa".