Gary Casteel, the union's newly elected secretary-treasurer, said the UAW will reveal its plan for workers at the Daimler plant in Tuscaloosa, Alabama "probably in the coming week."
New UAW President Dennis Williams said Casteel, 56, will lead the union's efforts to gain membership by organizing foreign automakers, which are primarily located in the South.
Casteel did not offer details of the UAW's plan in Alabama.
Sonny Hawthorne, a leading anti-UAW worker at the Mercedes-Benz plant, told Reuters the union would have the support "of 25 to 30 percent (of plant workers), at the most" if a vote were held today.
Hawthorne said he was confident the union's efforts to organize the factory will fail.