The WPP agency is in final talks with BBC Worldwide, which has yet to confirm the deal. BBC Worldwide, the commercial arm of the BBC, put the account out to tender in August, ahead of launching a host of new channels across EMEA and the Asia-Pacific region.
The review, handled by the AAR, does not affect the £1m media planning and buying account for BBC Magazines' activities in the UK, currently handled by Omnicom's PHD.
This latest win for MEC follows a string of recent account gains, including Freeview and the BT media planning account, previously handled in house.
BBC Worldwide, which includes global TV sales, magazines and digital media, spent just more than £7m on advertising in the 12 months to the end of June, according to Nielsen Media Research.
Global Channels, which launched 18 months ago, covers BBC Prime, BBC Food and BBC America, as well as a range of themed channels - including BBC Entertainment and BBC Knowledge - which are being rolled out globally.