According to a statement posted on X by the Polish government's spokesman, Adam Szłapka, Donald Tusk will be accompanied at a leader's meeting by his security adviser, Minister Robert Kupiecki, who has been involved in the negotiations from the outset.
Among the European politicians expected to attend are France's President Emmanuel Macron and the UK's Prime Minister, Keir Starmer.
Ukraine's President Volodymyr Zelensky is planning to continue talks in the German capital with US representatives on a proposed peace plan.
The first round of discussions, which included Germany's Chancellor Friedrich Merz, took place on Sunday, 14 December, and was described by the US delegation as a significant step forward.
Kyiv is seeking strong security guarantees from the United States, formally endorsed by Congress.
Ukraine has made clear that it does not want to cede the whole of the Donbas region to Russia and is insisting that the current front line should be frozen.
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Source: IAR/X/@adamSzlapka