President Emmanuel Macron has named centrist leader François Bayrou as France’s next prime minister, in a bid to end months of political turmoil.

Bayrou, a 73-year-old mayor from the south-west who leads the MoDem party, said everyone realised the difficulty of the task ahead: “I think reconciliation is necessary.”

He is seen by Macron’s entourage as a potential consensus candidate and his task will be to avoid the fate of his predecessor. Ex-Brexit negotiator Michel Barnier lasted just three months and was ousted by MPs nine days ago.

Macron is half-way through his second term as president and Bayrou will be his fourth prime minister this year.

French politics has been deadlocked ever since Macron called snap parliamentary elections during the summer and an opinion poll for BFMTV on Thursday suggested 61% of French voters were worried by the political situation.

Although a succession of allies lined up to praise Bayrou’s appointment, Socialist regional leader Carole Dega said the whole process had become a “bad movie”. Far-left France Unbowed leader Manuel Bompard complained of a “pathetic spectacle”.

The centre-left Socialists said they were ready to talk to Bayrou but would not take part in his government. Leader Olivier Faure said because Macron had chosen someone “from his own camp”, the Socialists would remain in opposition.

President Macron has vowed to remain in office until his second term ends in 2027, despite Barnier’s downfall last week.

He cut short a trip to Poland on Thursday and had been expected to name his new prime minister on Thursday night, but postponed his announcement until Friday.

He then met Bayrou at the Elysée Palace and a final decision was made hours later. But in an indication of the fraught nature of the talks, Le Monde newspaper suggested that Macron had preferred another ally, Roland Lescure, but changed his mind when Bayrou threatened to withdraw his party’s support.

Bayrou was set to move into the prime minister’s residence at Hôtel Matignon within hours, and a red carpet was rolled out for the transfer of power even before his name was confirmed.

His challenge will be in forming a government that will not be brought down the way his predecessor’s was in the National Assembly.

Macron has already held round-table talks with leaders from all the main political parties, bar the far-left France Unbowed (LFI) of Jean-Luc Mélenchon and far-right National Rally of Marine Le Pen.

The question is who can be persuaded to join Bayrou’s government, or at least agree a pact so they do not oust him.

When the only possible means of survival for a minority government is to build bridges on left and right, Bayrou has the advantage of having passable relations with both sides, reports BBC Paris correspondent Hugh Schofield.

Michel Barnier was only appointed in September and LFI MPs have already indicated they will propose another vote of no confidence in his successor’s government.

He was voted out when Le Pen’s National Rally joined left-wing MPs in rejecting his plans for €60bn (£50bn) in tax rises and spending cuts. He was seeking to cut France’s budget deficit, which is set to hit 6.1% of economic output (GDP) this year.

His outgoing government has put forward a bill to enable the provisions of the 2024 budget to continue into next year. But a replacement budget for 2025 will have to be approved once the next government takes office.

Barnier wished his successor his best wishes in what he called “this serious period for France and Europe”.

Under the political system of France’s Fifth Republic, the president is elected for five years and then appoints a prime minister whose choice of cabinet is then appointed by the president.

Unusually, President Macron called snap elections for parliament over the summer after poor results in the EU elections in June. The outcome left France in political stalemate, with three large political blocs made up of the left, centre and far right.

Eventually he chose Barnier to form a minority government reliant on Marine Le Pen’s National Rally for its survival. Macron is now hoping to restore stability without depending on her party.

Three centre-left parties – the Socialists, Greens and Communists – broke ranks with the more radical left LFI by taking part in talks with Macron.

However, they made clear they wanted a prime minister from the left, rather than a centrist.

“I told you I wanted someone from the left and the Greens and I think Mr Bayrou isn’t one or the other,” Greens leader Marine Tondelier told French TV on Thursday.

Patrick Kanner of the Socialists said that just because his party was not joining Bayrou’s government, “that doesn’t mean we’re going to bash it”.

Sébastien Chenu, a National Rally MP, said for his party it was less about who Macron picked than the “political line” he chose. If Bayrou wanted to tackle immigration and the cost of living crisis then he would “find an ally in us”.

Relations between the centre left and the radical LFI of Jean-Luc Mélenchon appear to have broken down over the three parties’ decision to pursue talks with President Macron.

After the LFI leader called on his former allies to steer clear of a coalition deal, Olivier Faure of the Socialists told French TV that “the more Mélenchon shouts the less he’s heard”.

Meanwhile, Marine Le Pen has called for her party’s policies on the cost of living to be taken into account by the incoming government, by building a budget that “doesn’t cross each party’s red lines”.