Cerar was required to report his assets within a month after being confirmed as MP. The commission will now give him a new window, between 15 and 30 days, to report his assets.

Boris Štefanec, the head of the watchdog, said Cerar would merely be censured if he fulfils his duty, else he faces a fine.

Cerar is expected to submit the requisite report by Thursday, according to a press release from his party, which said he regretted the omission.

Although the infringement is largely inconsequential, it could undermine his public image of a moral and ethical leader that had helped him win the election.

This was echoed by Transparency International Slovenija, which said that this was a "minor infringement" but a bad omen for the incoming government.