The meeting between the two Polish leaders is scheduled for noon at the presidential palace in Warsaw, Nawrocki's spokesman, Rafał Leśkiewicz, announced on Wednesday.
Leśkiewicz wrote on X that the meeting had been requested by Tusk.
Earlier on Wednesday, Tusk joined online talks with other European leaders ahead of Friday's US-Russia summit, while Nawrocki took part in a separate teleconference between EU leaders and Trump, Polish state news agency PAP reported.
Tusk said Washington had made a last-minute request for Nawrocki—a pro-Trump conservative—to join the Ukraine teleconference instead of him.
"Just before midnight yesterday, we were informed, alongside our European partners, that the American side would prefer that Poland be represented by the president in contacts with President Trump," Tusk told reporters.
He said he respected the request to keep contacts at the presidential level.
The White House did not comment on whether it had specifically asked for Nawrocki to join, the Reuters news agency reported.
Nawrocki, a Euroskeptic and ally of Trump's MAGA movement, visited the White House during Poland's presidential campaign earlier this year. He defeated centrist Warsaw Mayor Rafał Trzaskowski, a Tusk ally, at the ballot box in June.
Polish government spokesman Adam Szłapka said on Tuesday that Tusk, a former top EU official, had been slated to attend the call.
Nawrocki’s foreign policy adviser, Marcin Przydacz, told reporters on Wednesday he had "no information" that Tusk had planned to take part.
'We must cooperate on matters of security, foreign policy, war and peace'
Tusk said his government adopted a position on the planned US-Russia talks on Tuesday and conveyed it to Nawrocki "in the context of his contacts with the US administration."
He added that, despite their political differences, he and Nawrocki "must cooperate on matters of security, foreign policy, war and peace."
Under Poland’s constitution, the government directs foreign policy, while the president, when representing the country abroad, should present positions approved by the government, Tusk said.
"It's possible that tomorrow I will talk about this with President Nawrocki, so that we never allow ourselves to be played against each other—either by our enemies or by our friends," he added.
Wednesday’s consultations included a small-format meeting of European leaders and Ukrainian President Volodymyr Zelensky, which Tusk attended; a teleconference with Trump and Zelensky, where Poland was represented by Nawrocki; and a larger meeting of 30 European leaders, which included Tusk again, reporters were told.
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Source: IAR, PAP, Reuters