Euro RSCG Wnek Gosper Partners will go head-to-head against Vallance Carruthers Coleman Priest in a pitch for the company's flagship Extra Strong Mints and Softmints products.
The relationship between Euro RSCG and Cadbury is said to have weakened following the departure of the agency's former joint chairman Brett Gosper to McCann-Erickson in America back in August.
The strong and soft mints account is believed to be worth up to £5 million but, more importantly, could see VCCP secure a place on the Cadbury Trebor Bassett roster if it wins the business.
At present, Cadbury Trebor Bassett splits its creative advertising account between Euro RSCG and Publicis.
Euro RSCG creates the idents for the ITV soap opera Coronation Street.
In April, the agency also produced a burst of advertising for the energy chocolate bar Boost Guarana.
Trebor Softmints were originally relaunched by WCRS back in 1997 using a campaign that played on the crunchy-yet-chewy qualities of the sweet.
A year later, Mother was handed the task of promoting Extra Strong Mints, ending WCRS's monopoly of Trebor Bassett's advertising roster.
Cadbury Schweppes merged its Trebor Bassett sugar confectionery business into its Cadbury chocolate division in 2000 in a major restructure of its UK business.
Starcom Motive was recently appointed to handle its £30 million media account.