The right-wing parties in talks to form the next Dutch government are ready to take the “next step” towards appointing a cabinet, 14 weeks after the general election.

Kim Putters, the man charged with overseeing the second phase of negotiations, emerged from two days of talks at the Zwaluwenberg estate in Hilversum to say he was ready to provide his conclusions to parliament. His report is due on Thursday.

The four leaders – Geert Wilders of the PVV, Dilan Yesilgöz of the VVD, Pieter Omtzigt of NSC and Caroline van der Plas of the BBB – gave little away as they drove away on Tuesday evening, but NOS quoted sources who said the most likely outcome was an “extraparliamentary” cabinet.

“I have spoken with the four party leaders of PVV, VVD, BBB and NSC at the same time,” Putters said. “That hadn’t happened until now in this stage of the negotiations and it was needed. We have had good discussions and they have produced results.”

Exactly what form a new government will take is unclear, but all four parties are willing to supply ministers from their own ranks, while others will be picked for their expertise but not bound by party discipline.

An extra-parliamentary cabinet will have looser ties to the parliamentary parties than a conventional coalition supported by a majority of MPs in the lower house. Omtzigt argues this will make parliament more independent and strengthen its ability to scrutinise laws proposed by ministers.

The four parties are also expected to produce a shorter coalition agreement, which outlines the direction the cabinet should take on key issues such as immigration and public spending but leaves it to ministers to fill in the details. That could shorten the next stage of negotiations.