The Middle Eastern state of Abu Dhabi is reported to be considering a bid for Opel.
A labour leader at Opel reported that the German state of North Rhine-Westfalia has held talks with a high-ranking member of Abu Dhabi's royal family on investing in the firm last week.
A spokesman for Germany's economy ministry said the German government is talking to several partners about Opel's future, but declined to comment on the Abu Dhabi reports.
"There are several interested parties. The government is participating in several talks. We're not commenting on details," the spokesman said.
Opel and British sister brand Vauxhall could run out of money in the coming months unless European governments or investors provide a cash injection, Opel's owner, GM, has previously warned.