Under the plan, which is named "Project Birch", the finance minister has raised the UK Treasury's capacity to handle bespoke bailouts of "viable" companies which have exhausted all options, including government loan schemes, the Financial Times newspaper reported earlier on Sunday.
The newspaper also reported that the state could buy stakes in crucial businesses that are facing acute financial problems.
However, it added the Treasury will not initially look at taking equity stakes in companies that are struggling, with the preferred option being extension of loans.
Companies from across sectors - including steel, aviation and aerospace - are among those facing acute problems and the offer of the Treasury will apply across all sectors of the economy.