FRANKFURT (AFP)--Fiat SpA (F.MI) Chief Executive Sergio Marchionne has denied preparing an offer for General Motor Corp.'s (GM) Adam Opel AG unit while Fiat pursues its offer for part of Chrysler, an Italian union source told AFP Friday.

GM Europe maintained its position that "there are discussions with investors, but we will say nothing about the details," according to spokesman Joerg Schrott. "The situation is complex and sensitive."

Several German politicians and union leaders have confirmed talks between the German government and Fiat, in addition to discussions with the Canadian auto parts maker Magna International Inc. (MGA).

"Magna and Fiat are among the possible partners. There is clearly no preliminary decision at the moment however," Hesse state premier Roland Koch said.

Opel's headquarters are in the western German state, near Frankfurt.

Thursday, Marchionne did not rule out an Opel offer, though he stressed his priority was sealing a deal with distressed U.S. car maker Chrysler.

Opel is seen as a national automotive symbol in Germany where it employs almost 26,000 workers.

The company has been owned by GM for 80 years, though the U.S. company has indicated it is ready to give up part of its holding.

Opel's survival, which depends on an investor the government is prepared to help, is crucial given general elections set for late September.

Opel workers are wary of a tie-up they fear would lead to job cuts.

Supervisory board member Armin Schild, who represents the IG Metall trade union, has compared Opel and Fiat to "two sick parents" who would not create a viable ensemble.

Pieper acknowledged that "between 5,000 and 8,000 jobs would disappear" if Fiat bought Opel, but added: "That also means 20,000 would be saved."

He was convinced such a scenario "is the best solution for Opel" because without GM it needs a partner to become big enough to benefit from economies of scale.