European leaders are negotiating a deal that would lead to unprecedented outside intervention in the Greek economy, including international involvement in tax collection and privatisation of state assets, in exchange for new bail-out loans for Athens.

People involved in the talks said the package would also include incentives for private holders of Greek debt to voluntarily extend Athens’ repayment schedule, as well as another round of austerity measures.

Officials hope that as much as half of the €60bn-€70bn ($86bn-$100bn) in new financing needed by Athens until the end of 2013 could be accounted for without new loans. Under a plan advocated by some, much of that would be covered by the sale of state assets and the change in repayment terms for private debtholders.