Bankers are running out of private-sector solutions for Monte dei Paschi di Siena and have told the Italian lender to prepare for a state bailout this weekend after prime minister Matteo Renzi was felled by a referendum defeat.

While financial markets responded relatively calmly to the referendum result, people briefed on the situation said the political upheaval made it "more difficult" to secure a 1 billion euro investment from Qatar on which Monte dei Paschi's 5 billion euro capital-raising plan hinges.