Apcor, the Portuguese cork trade body, wants an agency to promote technological advances made by the industry's workers, who turn cork into bottle-stoppers, insulation materials and other industrial items.
The industry is facing increasing competition on the bottle-stopping front from screw-caps and plastics.
Previous Apcor efforts have involved the use of Weber Shandwick, which worked for the body internationally between 2001 and 2003.
Apcor director of the international campaign for cork, Elisa Pedro, is leading the agency search. She has shortlisted UK agencies, with a hire likely in around six weeks.
Apcor has nearly 300 members, accounting for 80 per cent of cork production in Portugal - the world's biggest producer of natural cork.