Three bidders are invited by General Motors this week to talk about a potential Saab takeover.

The sale of insolvent car brand Saab, owned by General Motors and based in Sweden, looms nearer as GM has invited three groups to meet for talks this week, Financial Times writes.

The groups are Swedish supercar maker Koenigsegg, the private holding company Renco and a third group of investors from the US state of Wyoming, according to two people briefed on the sale who requested anonymity because details of the sale are confidential.

The acquisition is said to be "very complex and unconventional". GM will put in assets and cash worth $500m to finance Saab's spin-off. But the new owner must pay GM back if they succeed turning Saab around.

According to FT, the cash amounts pledged by the three bidders are diverged, but they are smaller than the amount GM is contributing.

Sweden's industry minister Maud Olofsson said to the Dow Jones news bureau on Tuesday that it’s hard to tell if GM will manage to find a suitable new owner for Saab.

"Saab needs (a new owner) that has a lot of capital and can be a long-term owner, and who has a business plan for what they will do with Saab in the future," she said.

Maud Olofsson is responsible for the government’s decision whether to guarantee a EUR500 million loan that Saab is seeking from the European Investment Bank or not.

"There must be a new owner and then they can come to us and request loan guarantees," she said to Dow Jones.