General Motors sent its clearest signal yet on Monday that none of the bidders for Saab had submitted an offer that would prompt the automaker to reverse a decision to shut down the Swedish luxury brand, according to Reuters.

"We're closing down Saab," GM Chairman and acting Chief Executive Ed Whitacre told reporters on the sidelines of the Detroit auto show. "We're winding it down."

GM Vice Chairman Bob Lutz said that the U.S. automaker would press ahead with closing down Saab unless a new bid emerged that was "financially better for us than the wind-down."

GM hired AlixPartners, the restructuring firm that assisted in its U.S.-government backed bankruptcy last year, to handle the wind-down of Saab.