The betting company is talking to agencies ahead of holding chemistry meetings and a shop is likely to be appointed before Christmas. The7stars has declined to repitch.
Tina Fegent, the procurement consultant, is assisting William Hill in running the process.
William Hill spends £5.2 million on TV advertising, £4.6 million on press and £3.3 million online, according to figures from Nielsen.
Earlier this year, William Hill signed up to sponsor the UK coverage of the Italian, Russian and Dutch football premier leagues on the sports broadcaster ESPN, in a deal brokered by the7stars.
William Hill’s creative agency, Beattie McGuinness Bungay, which became the third to work with the bookmaker within a year when it was appointed in January, is unaffected by the media review.
BMB, which followed The Brooklyn Brothers and The Bank on the business, has since created a series of ads to highlight William Hill’s betting services. Spots feature flashing words and images to communicate its range of services and technology.