Cabinet negotiator Sybrand Buma has advised D66, VVD and CDA to start drafting an agreement that could form the basis of “a stable cabinet”.

This could, Buma said, lead to a majority coalition if another party joined in later, but also left open the option of partial agreements with other parties in parliament and the senate.

Buma said the three parties now need to move towards a final accord, though he would not predict whether the current talks are “a final step or an interim step”.

He has not set a deadline for the discussions but parliament can still choose to do so during Wednesday’s planned debate.

The meetings between party leaders at the weekend had produced enough support for this next phase, Buma said. “These parties must seek broad backing in both houses of parliament,” he said. “That can be in an incidental or structural form.”

He said both a majority and a minority cabinet remain possible.

Buma also advised the three parties to involve other party leaders early in the process. “It will require extensive consultation with other parties, and an understanding that forming a government is a process of give and take,” he said.

GroenLinks-PvdA leader Jesse Klaver reacted angrily to the news, saying VVD leader Dilan Yesilgöz is being rewarded for keeping his party out of the coalition. She has said repeatedly that her party will not join a majority government which includes the left-wing alliance.

A minority cabinet involving the right-wing VVD and two centre parties would be a risky experiment given the current global instability, as well as cheating the parties that wanted change, Klaver said

A three-way minority coalition would only have 66 seats in the lower house, 10 short of a majority, and be dependent on support from smaller parties to get its legislation through parliament. It would also only control 22 of the 75 seats in the senate.

The VVD was keen to have far right party JA21 in the new government but Jetten has rejected that option.