Apart from Zenith, media planning incumbent OMD, a local agency and Carat also took part in the review.
Sources place the value of the account at close to US$44 million this year.
OMD has held the media planning component of the account since January this year, while the buying part was handled by a local agency.
Although representatives from OMD would not comment on the decision, the departure of InBev’s vice-president of marketing, Eric Melloul a few months ago is believed to have influenced InBev’s decision to consolidate its media account for several of its key brands.