Tusk met with leaders of the four-party coalition on Tuesday to discuss a planned Cabinet reshuffle, state news agency PAP reported.
"The government has a stable majority," Tusk wrote on the X social media platform after the talks.
A day earlier, lower-house Speaker Szymon Hołownia, whose centre-right Poland 2050 group is part of Tusk's coalition government, denied speculation that he was involved in talks to form a new government with the opposition.
Tusk said he took Hołownia's "explanations and declarations" seriously and reiterated the coalition's unity after the meeting.
Tusk has previously said the government will undergo a reshuffle this summer. He told reporters in late June that he would unveil "the new shape of the Cabinet" around July 15.
The prime minister has said the shake-up will aim to improve the government’s functionality, including by consolidating ministries for greater efficiency.
The expected reshuffle comes after Tusk's Civic Coalition (KO) failed to win the presidency in a recent election—a setback that could hinder his pro-European agenda over the remaining two and a half years of his government's term.
Meanwhile, Kaczyński has outlined plans for his conservative opposition Law and Justice (PiS) party to return to power in the 2027 parliamentary election.
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Source: IAR, PAP