Sweden's parliament will vote on Thursday on Social Democratic Party leader Magdalena Andersson's nomination as prime minister, Speaker Andreas Norlén announced on Tuesday, as a month-long deadlock over forming a government continues following September's general election.

Norlén said he would formally nominate Andersson to lead a single-party Social Democratic government after she acknowledged that negotiations with potential coalition partners had failed to produce an agreement capable of securing sufficient parliamentary support.

Andersson said progress had been made in talks but that the conditions were not in place to form a government acceptable to parliament. She nevertheless said she was ready to face a vote on her nomination.

The announcement came after Andersson met Norlén on Tuesday to report on her efforts to form a government. She had been given until Monday to conclude the latest round of negotiations, which resumed on Oct. 5.

The Left Party and the Green Party, both potential allies of the Social Democrats, opposed the prospect of a single-party government. Left Party deputy leader Ida Gabrielsson said her party would vote against Andersson's nomination, while Green Party co-leader Amanda Lind reiterated her preference for a majority government involving all four parties in the centre-left bloc, according to Swedish public broadcaster SVT.

The main obstacle has been a dispute between the Left Party and the Centre Party over the composition of the government. The Left Party has demanded cabinet positions in return for its support, while the Centre Party has ruled out serving in a government alongside it.

The impasse has persisted despite the centre-left bloc securing a narrow parliamentary majority in the Sept. 13 election. The Social Democrats, Left Party, Green Party and Centre Party won a combined 176 seats in the 349-member Riksdag, compared with 173 seats for the right-wing bloc led by outgoing Prime Minister Ulf Kristersson.

The Social Democrats emerged as the largest party, winning 99 seats, followed by the Moderate Party with 70 and the Sweden Democrats with 62, according to official election results.

Andersson was first tasked with exploring the formation of a government on Sept. 18, after Kristersson resigned following his bloc's election defeat. She returned the mandate on Sept. 28 after the Left Party backed Norlén, the Moderate Party's candidate, in the parliamentary speaker election rather than the Social Democrats' candidate.

Norlén reassigned Andersson the task on Oct. 2, saying the centre-left bloc remained best placed to form a government that parliament could tolerate. The renewed negotiations, however, failed to resolve the divisions among its four parties.

Under Sweden's system of negative parliamentarism, a prime ministerial candidate does not need an affirmative majority to take office. Instead, the nomination succeeds unless at least 175 of the 349 lawmakers vote against it.

The parliamentary vote on Thursday will therefore test whether Andersson can secure sufficient tolerance from lawmakers even without a coalition agreement. Her nomination could fail if enough members of parliament unite against her, potentially forcing Norlén to nominate another candidate.

The continuing impasse leaves Sweden without a new government more than a month after the election, with disagreements among parties that collectively command a parliamentary majority preventing them from agreeing on how to govern. (ILKHA)