The UN Human Rights Commissioner Saeed Al Hussain has said that the Report should contain what had been investigated between January and December 2014.
He has also drawn reference to the Lessons Learned and Reconciliatory Commission set up by Sri Lanka to probe war crimes.
Meanwhile Sri Lanka Foreign Affairs Minister Mangala Samaraweera has told the Financial Times in an interview that the government was looking to set up its own internal investigation into war crimes in place of an international probe.
Samaraweera had said that the problems of the aggrieved parties will be looked into which he assured would be taken up during his upcoming meeting with US secretary of State John Kerry at a meeting in Washington next week.
The Committee set up by former President Mahinda Rajapaksa to probe the status of displaced persons and human rights violations after the war has also finalized its report.
It will be handed over to President Maithripala Sirisena by the head of the Committee Maxwell Paranagama.
Paranagama said the Report contains information on human rights violations after the war and evidence provided by relatives of missing persons.