Talks over the future of General Motors Corp.'s (GM) Adam Opel GmbH unit Wednesday will end in a bridge financing agreement for the German unit, German Vice Chancellor and Foreign Minister Frank-Walter Steinmeier said Wednesday.

His comments come with General Motors at risk of filing for insolvency in the coming days and with the German government aiming to keep Opel afloat to allow more time for talks with potential investors.

"I am certain that we will wrap up tonight the state-backed bridge financing. This is necessary. Opel needs this air to breathe," Steinmeier told reporters.

Chancellor Angela Merkel, key cabinet ministers, governors of the German states with Opel plants, representatives from GM and the U.S. Treasury and the bidders for Opel are meeting in the chancellery Wednesday.

In this meeting, Germany will decide whether it regards at least one of the three bids for Opel as solid. This is a precondition for offering a trusteeship model for Opel that would allow giving bridge financing to the company for the next months to allow negotiations with investors to continue.

The bridge, or interim, financing of around EUR1.5 billion would come mainly from state-owned bank KfW and Landesbanken of the states with Opel plants.

Austrian-Canadian company Magna International Inc. (MGA) and Italian auto maker Fiat SpA (F.MI) are believed to be leading a field of bidders for the company.

RHJ International SA (RHJI.BT) also has launched an offer. On Tuesday, Chinese auto maker Beijing Automotive Industry Corp. (BAIC) emerged as a possible fourth bidder, but it hasn't yet provided a detailed bid.

"There are now serious, and I find interesting, offers on the table," Steinmeier told reporters. "We should now end the public exhibition and enter concrete negotiations."

He declined to say whether Wednesday's meeting might result in a government outlining its preferred bid.

-By Andrea Thomas, Dow Jones Newswires; +49 (0)30 2888 4126; andrea.thomas@dowjones.com