Through RBS, MediaCom has handled media for the group, which owns the insurance brands Direct Line, Churchill and Green Flag, for the past ten years.
The review follows a restructure of the company’s marketing operations in September last year and the promotion of Mark Evans to the role of group marketing director. Evans is believed to be leading the pitch process.
MediaCom successfully defended the business in 2010. The WPP agency declined to comment on the review.
A Direct Line spokesman said: "Media is the last piece of the marketing mix due to be looked at since we divested from RBS… MediaCom will be invited to repitch."
Direct Line Group spent £48.1 million on media in the 12 months to 30 September 2012, according to Nielsen.