A number of sources have confirmed to PRWeek that a pitch is currently taking place, with several agencies still believed to be involved in the process. PRWeek understands the brief will be Europe-wide.
Brands in the Mondelez group include Toblerone, Oreo and Philadelphia cheese.
Mondelez told PRWeek in a statement: "We regularly review our ways of working with our agencies. Given the high calibre of our brands, it's vital that we always have the right mix of agencies and talent to draw from."
As reported in May, Golin handles consumer PR for Mondelez-owned ethical chocolate brand Green & Black's - an account that Edelman had held for five years.
Golin also handles PR for fellow Mondelez confectionery brand Cadbury. That account includes work on brands such as Creme Egg and Dairy Milk. Golin declined to comment.
The search for a new agency is not expected to affect Golin or any agencies currently on the Mondelez PR roster.