Monte dei Paschi di Siena said it was in exclusive talks with a domestic fund and a group of investors over the sale of its bad loan portfolio, which it needs to offload before it can be taken over by the state.

The negotiations mark the latest stage in a long-running process to rescue the world's oldest bank, which includes efforts to enable it to shed its bad loans.

Italy's fourth biggest bank had €26 billion in gross defaulting debts at the end of last year and has set a June 28 deadline for the talks with Quaestio, the fund which manages Italy's banking industry rescue fund Atlante and will also conduct negotiations on behalf of other investors.

The bank did not name those investors but sources have said they are US private equity fund Fortress and Italian bad loan manager Credito Fondiario, in which US fund Elliott has a 44 per cent stake.

Monte dei Paschi, which emerged as Europe's weakest bank in stress tests in July last year, has requested a state bailout to help to fill an €8.8 billion capital shortfall after failing to raise funds on the market in December.

This would pave the way for the Italian government to take a stake of around 70 per cent in the bank as early as in July

The bank expects to get a nod from European regulators by the end of June, a source close to the matter said, after months of negotiations over the terms of its bailout and a restructuring plan that is set to include thousands of job cuts.

This would pave the way for the Italian government to take a stake of around 70 per cent in the bank as early as in July, the source said.

Part of the capital shortfall will be plugged through the conversion of junior debt into shares in line with new European rules seeking to limit the use of taxpayer money to rescue ailing banks.

While talks to save the Tuscan bank seem to be heading towards a positive conclusion, Rome faces a much bigger hurdle winning EU backing for a state rescue of two Veneto-based regional lenders. The two, Popolare di Vicenza and Veneto Banca, have a combined capital shortfall of €6.4 billion.

To allow Monte dei Paschi to shift the bad debts off its balance sheet, Atlante and the other investors are set to take on the majority of some tranches of bad loans repackaged as securities, sources close to the matter told Reuters last week.

The sources said Atlante and the other investors could buy the junior and mezzanine tranches in a securitisation of Monte dei Paschi's bad loan portfolio for €1.3 billion, while the senior tranche would be backed by a state guarantee and sold to institutional investors.

One of the sources said Fortress and Credito Fondiario were carrying out due diligence on the portfolio, which was expected to close on June 9. Fortress, Elliott and Credito Fondiario declined to comment.