The PD and the M5S are the biggest opposition parties, polling respectively at around 19 per cent and 15.5 per cent in recent polls.
The left’s failure to form a coalition was a major factor in the Giorgia Meloni led right-wing win in the last general election in September, 2022.
M5S leader and former prime minister Giuseppe Conte has said his party can ally with the PD on specific issues and in specific areas but not form an organic alliance.
Italy’s two biggest centrist parties, Azione and Italia Viva, are also loth to join any centre-left alliance.
ANSA