Direct agencies are on alert for the announcement, which is expected to come within weeks.
The COI last reviewed its direct marketing framework in 2005 when it appointed 23 agencies to the roster, including Chemistry, CMW, EHS Brann, Kitcatt Nohr Alexander Shaw, OgilvyOne and Rapp.
The operational framework review will select suppliers across seven specialisms: contact centre (live and automated); data services; email; face to face (field and experiential); mailing house and fulfilment services; digital personalised print and direct marketing consultancy.
Suppliers have been given a deadline of 10 February to register their interest. The new framework is expected to be in place by the end of September.
The review will be handled by Marc Michaels, the director of direct and relationship marketing at the COI.
Michaels said: "This is a great opportunity to refresh our supplier base and ensure we are prepared for the coming years to continue to deliver excellent service through excellent supplier partnerships."
This story originally incorrectly stated the COI had already launched the review of its direct marketing creative agency roster.