Greece has extended a buyback invitation that is part of its international bailout agreed with the EU and IMF last month.
The deadline has been pushed forward by a day and a half in a bid to get more offers from bondholders.
The offer had been due to end on Friday with Athens aiming to buy back bonds with a face value of about 30 billion euros at deeply discounted prices.
That would lower its debt load to make it more manageable, and meet a condition demanded by its lenders for the release of its next aid tranche of 34.4 billion later this month.
Greece was given 10 billion euros to conduct the buyback.