Oct. 27 (Bloomberg) -- Workers at Adam Opel GmbH will consider actions to protest General Motors Co.’s move to delay a decision on the sale of a majority stake in the European unit.

Union representatives of will meet Oct. 30 to discuss measures in reaction to GM’s decision to postpone an agreement on the sale, Klaus Franz, Opel’s top labor leader, said in an e-mailed response to questions, without elaborating.

“We don’t accept the delay,” Franz said in an interview today. “We perceive great displeasure among the employees.”

GM’s board will use its Nov. 3 regular meeting to consider changes to the proposal from Canada’s Magna International Inc. and Russian partner OAO Sberbank to buy 55 percent of Opel. It will also examine a letter from German Economy Minister Karl- Theodor zu Guttenberg that said Germany’s financial backing for Opel’s restructuring wasn’t reserved for Magna.

Opel, based in Ruesselsheim near Frankfurt, employs about 50,000 people in Europe, including about half in Germany.

GM Chief Executive Officer Fritz Henderson had projected that a final accord could be completed by last week. The transaction is being held back after the European Commission expressed concerns that Germany improperly favored Magna’s bid by tying 4.5 billion euros ($6.7 billion) in aid solely to a purchase by the Canadian car-parts manufacturer.

Karin Kirchner, a spokeswoman for GM in Zurich, declined to comment.

Opel workers in Spain today called off a four-day strike after reaching an initial job agreement with Aurora, Ontario- based Magna, union negotiator Chema Fernando said in an interview.

To contact the reporter on this story: Chris Reiter in Berlin at creiter2@bloomberg.net

Last Updated: October 27, 2009 09:55 EDT