The news comes a day after former owner Balram Chainrai re-entered the running to buy back the club eight days after his company Portpin announced their interest was at an end.
That decision appeared to pave the way for fans' group PST, backed by a loan from the local council, to complete their rescue of the club who remain in administration and in danger of liquidation.
Yet Hong Kong businessman Chainrai remains Portsmouth's biggest creditor and, having expressed doubts about the viability of the PST's bid, he submitted a fresh offer to administrator Trevor Birch.
However, Birch announced tonight PST have also made a fresh offer and said: "We have received a revised offer from the Trust and will study the documents in detail over the next few days.
"There will be aspects that need further clarification and we will work with the Trust to achieve that clarity before deciding how best to proceed with the Trust and Portpin offers."
