Though Szydlo's government is riding high in opinion polls, ruling Law and Justice head Jaroslaw Kaczynski is thought to be advocating a change.
Poland's nationalist-conservative Law and Justice Party replaced Prime Minister Beata Szydlo with Finance Minister Mateusz Morawiecki after weeks of speculation.
The replacement comes at the beginning of what is expected to be a broader government reshuffle to prepare the right-wing party for votes due in the next three years.
Germany's Lufthansa plans to open in Poland in co-operation with MTU Aero Engines an engine servicing plant worth 150 million euros that is to start functioning in 2020 and employ 800 people, Puls Biznesu reported.
Further changes to the government are due in January, the PAP said.
Mazurek said Szydlo, who had been prime minister since elections brought PiS to power in 2015, resigned shortly before Morawiecki's appointment.
A Polish government official says the country's lawmakers will hold a confirmation vote next week to appoint Finance Minister Mateusz Morawiecki as the new prime minister. Poland now enjoys record low unemployment, growing wages and growth of over 4 percent per year.
Poland's conservative ruling party says Prime Minister Beata Szydlo has resigned and will be replaced by Finance Minister Mateusz Morawiecki.
She is expected to formally tender her resignation to PiS-allied President Andrzej Duda on Friday, while the PiS-controlled parliament could approve Morawiecki's new administration by Tuesday, according to media reports.
"The last two years - it was an extraordinary time for me and the service to Poland and Poles was an honour", Szydło said on Twitter.
The Law and Justice party said in a statement Thursday night that "many successes were achieved in key areas of Polish life" during Szydlo's tenure despite "the huge determined resistance by enemies of the ideas of the good change" both inside and outside Poland.
The EU has said the Polish reforms pose a "systemic threat" to the rule of law, with Brussels having warned it could trigger Article Seven of the EU's treaties - the so-called "nuclear option" that freezes voting rights.
Szydlo's government insisted that the reforms are needed to root out corruption and purge a judiciary it believes is stacked in favour of supporters of former prime minister Donald Tusk, who is now president of the European Council.
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