Former Portsmouth owner Balram Chainrai has submitted a new offer to buy the League One club, the Pompey Supporters' Trust (PST) and Watford owner Laurence Bassini has also registeredtheir interest in Portsmouth.
Chainrari, who is unpopular with some sections of supporters, withdrew his original bid through his company Portpin after being criticised by manager Michael Appleton over changes to the transfer budget.
PST will present its bid to administrator Trevor Birch on Friday.
Birch, acting for the administrators PKF, said:
"We have been working with the Trust since Portpin's original offer was withdrawn and understand that the Trust is on track to submit a business plan and revised offer tomorrow.
"We will assess its bid once it has been submitted and will then determine which offer provides the best deal for creditors, as is our duty as court appointed administrators."
The PST says it remains hopeful it can take over the financially troubled outfit, which has been in administration since February.
"The PST bid remains on track," spokesman Colin Farmery said.
Due to the advanced nature of the current talks with Chainrai and the PST, Bassini is not seen as a serious option at this stage of discussions.