The review, which is being handled by the company's London-based procurement department, will not affect Amex's global agencies, Ogilvy & Mather, OgilvyOne, Ogilvy Interactive and Carat.
However, it will affect all of Amex's remaining suppliers throughout Europe, the Middle East and Africa. These include Euro RSCG KLP, CCHM:Ping, Gyro, Toast and Direct Know How.
Over the next few months, Amex will examine the quality of the work produced and the levels of recall it achieves. It will also scrutinise how much it has paid its marketing suppliers in recent years.
Amex has not ruled out bringing in new agencies, but it is expected to shorten its roster. Amex has not yet decided if it will use an intermediate to conduct the review.
If you have an opinion on this or any other issue raised on Brand Republic, join the debate in the Forum.