Abu Dhabi's royal family might invest in Opel, a press report said on Monday.

The Westdeutsche Allgemeine Zeitung newspaper quoted family member Sheikh Hamdan indirectly as saying however that "no decision has been taken yet", according to Agence France-Presse (AFP).

Hamdan reportedly said that a meeting he had had last week with German regional premier Juergen Ruettgers of the state of North Rhine-Westphalia, home to an Opel plant, was nonetheless "very positive."

Opel is looking for private investors and EUR2.6bn in aid from the German government while chancellor Angela Merkel has indicated she would like to share the burden with others.

AFP noted that Abu Dhabi had said late last month it would take a 9.1% stake in Daimler for EUR1.95bn ($US2.64bn), becoming its biggest shareholder.