"The prime minister will announce the composition of the new Cabinet on Wednesday at 10 a.m.," Szłapka wrote in a post on the X social media platform on Monday.
The planned reshuffle is expected to affect several key posts in Tusk's government, though no official details have yet been released.
Polish media have speculated for weeks about the scope of the shake-up, with several officials now confirming the timing.
Deputy Prime Minister and Digital Affairs Minister Krzysztof Gawkowski said in a radio interview on Monday that some ministers without portfolio are expected to "end their service," while others may be reassigned.
"In some ministries, we’ll see personnel changes at the top," Gawkowski told private broadcaster Radio Zet in an interview.
Meanwhile, Foreign Minister Radosław Sikorski is expected to also serve as a deputy prime minister in the new Cabinet, according to broadcaster TVN24.
Tusk said earlier this month that his government retains a "stable majority" despite signs of internal tension within the ruling coalition following a recent presidential election defeat.
The reshuffle follows talks by Tusk's ruling Civic Coalition (KO) and its junior coalition partners—the agrarian Polish People’s Party (PSL), the centre-right Poland 2050 group and the Left—on how to reshape the Cabinet, state news agency PAP reported.
Speaking to reporters on June 20, Tusk announced plans to consolidate ministries for greater efficiency, saying the reshuffle would focus on improving the government’s functionality, including merging certain departments.
The changes come after the Civic Coalition failed to secure the presidency—a setback that could complicate Tusk's pro-European agenda during the remaining two and a half years of his government's term.
Meanwhile, opposition leader Jarosław Kaczyński has outlined plans for his conservative Law and Justice (PiS) party to return to power in the 2027 parliamentary election, including efforts to expand and restructure the party internally.
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Source: IAR, PAP