Fox's is understood to have shortlisted three agencies. The review is said to have been sparked by disquiet among Fox's senior management that the agency's creative work is too obscure. It is not known if St Luke's will repitch.
The review follows news of the agency's marketing director, Juliet Soskice, resigning.
Competing shops have been asked to submit strategic and creative proposals for a TV drive. Media buying, which is handled by Equinox Communications, is not affected.
Pitches, which are set to take place next week, come four months after the installation of a new senior management team at Fox's. John Ward, Eden Vale's former commercial director, was hired as the marketing director to work with the managing director, Jeff Halliwell.
Fox's was unavailable for comment as Campaign went to press.