Germany's hunt for a partner for struggling Opel has boiled down to two rival groups, Italy's Fiat
If Opel has to reduce output of its cars, it could offer capacity to other carmakers such as Peugeot
Magna therefore does not plan to close any Opel factories in Germany, while it might shut plants in Belgium's Antwerp and in Luton in the UK, the paper said.
The report comes as carmakers around the world reduce output and close factories as demand for cars is shrinking.
The government was working on a temporary financing deal for Opel in the event GM filed for bankruptcy before a deal with investors was agreed, he said then.
But Opel might still go bankrupt if both Fiat's and Magna's plans prove to be unsuitable, Guttenberg said, according to weekly newspaper Welt am Sonntag.
Fiat's strategy for the German carmaker centers around a three-way merger with Chrysler
(Reporting by Peter Dinkloh, editing by Will Waterman)