The company, owned by Pernod Ricard, is believed to have launched a series of creds and chemistry meetings for the Chivas Regal brand.
The brief is understood to focus on UK implementation and global planning.
The brand appointed John Doe in June to lead its global work with a brief to promote a series of short movies to the 27- to 40-year-old male demographic. It is thought the agency will be unaffected by the latest move.
Chivas Brother had not responded to requests for comment at the time of writing.