Allianz will chip in €300m to a fresh Greek rescue, the insurer's chief executive told a German magazine.

"We are talking about a financing commitment of the Allianz Group of about €300m by 2014," said Michael Diekmann told Der Spiegel in an interview.

Germany's Finance Minister Wolfgang Schaeuble had said on Thursday that the country's financial institutions will contribute €3.2bn, agreeing to roll over at least their Greek debt holdings that mature by 2014, Reuters reported.

Euro zone finance ministers have agreed to disburse a further €12bn to Greece. Details of a second aid package - expected to be of a similar magnitude to last year's €110bn bailout - afre expected be finalised by mid-September.

Diekmann also told Der Spiegel that Allianz had made a proposal of how to protect taxpayers from having to bear the burden of Greece's high debts.

"Part of the money earmarked for the European Stability Mechanism shall be spent on creating a bond insurer. It would insure bonds up to a nominal value of, for instance, 90%.

"That way investors get clarity over the maximal loss possible, namely 10%," he said.