Austrian-Canadian auto parts maker Magna International Inc. (MGA) has presented a "first interesting, rough plan" for General Motors' (GM) European unit Adam Opel GmbH, German Economics Minister Karl-Theodor zu Guttenberg said Tuesday.

Speaking after a meeting with officials from Magna, such as Co-Chief Executive Siegfried Wolf, zu Guttenberg said that the plan now requires reliable figures. Media reports have said Magna is working on a bid to take a majority stake in Opel.

Press reports have also said Fiat SpA (F.MI) is close to a deal with Opel and it reportedly plans to keep all four Opel plants in Ruesselsheim, Bochum, Kaiserslautern and Eisenach. The Italian carmaker's Chief Executive Sergio Marchionne has said he is open to giving Opel "a hard look" but said Fiat has "nothing to announce" regarding those reports.

-By Andrea Thomas, Dow Jones Newswires; 49-30-288-8410; andrea.thomas@dowjones.com