Last week, interim manager Joe Kinnear suggested that his reign at the club could run to 10 or 12 matches, rather than being six to eight as was first thought.
On Friday, three South African businessmen linked with a possible £300m takeover denied they had any intention to buy the club, with billionaire Johann Rupert saying he had "absolutely no interest and no knowledge".
The South African group were considered to be the frontrunners - with their interest in bringing Keegan back making them popular with the fans.
A Nigerian consortium was also believed to have presented its bid of about £350m to the club.
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