The declaration will happen at 1330 GMT, the source added, after Foreign Minister Hakan Fidan said this week that Turkey would make the declaration on Wednesday.
"Turkey's intervention pushes the international community to recognise and address the humanitarian crisis in Gaza," the source said.
In May, Turkey said it had decided to join the case launched by South Africa as it stepped up measures against Israel over the assault on Gaza, adding that its bid would follow the necessary legal preparations.
In June, Spain said it had asked to intervene in the case at the ICJ, the highest legal body of the United Nations set up in 1945 to deal with disputes between states.
Israel has repeatedly dismissed the case's accusations of genocide as baseless, arguing in court that its operations in Gaza are self-defence and targeted at Hamas militants who attacked Israel on Oct. 7.
(Reporting by Tuvan Gumrukcu; Writing by Daren Butler; Editing by Clarence Fernandez)

The panel of judges, with President Nawaf Salam (centre), at the International Court of Justice in The Hague, the Netherlands, during a non-binding ruling on 19 July 2024 on the legal consequences of the Israeli occupation of the West Bank and East Jerusalem. The ICJ advised that Israel’s settlement policy was in violation of international law. (Photo: EPA-EFE / Lina Selg)
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