The Diageo-owned brand has contacted agencies directly about the review. The appointed agency is expected to work on digital and direct activity across the region, including in the UK.
TMW currently handles the Guinness UK digital and direct business.
Abbott Mead Vickers BBDO, the brand's global advertising agency, has also created online activity as part of its broader campaigns.
Last year, TMW launched Guinness' first-ever iAd campaign. The ad began with a narrator promising to show the user where the best nights out were. It then split into four sections – pubs, gigs, comedy and sports – suggesting events and venues based on the user's location. The ad allowed users to overcome the problem of ordering a drink in a noisy pub by selecting an image of how many pints of Guinness they wanted to order from bar staff.
AMV BBDO was behind the Guinness online film for St Patrick's Day that featured friends herding together like sheep in activity that encouraged men to "round up their mates".
The film showed the men navigating potential obstructions, such as girls on a dance floor, until they reach their final destination – a pub that serves Guinness.