Exclusive: Euro Regulators expect Monte dei Paschi to ask Italy for help

"There is clearly an execution risk to the capital raising," said one official with knowledge of the rescue attempt, adding that the bank's value, about one ninth the size of the planned 5 billion euro cash call, would be a turn-off for investors.

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Reopening the question of state support, which had already been explored and dropped because of the losses it requires for bondholders under European bank crisis rules, is politically charged, and would reignite a dispute between Italy and Germany.

Berlin had objected to Rome's efforts to back the struggling bank without imposing a loss on its bondholders, according to another senior official.