The retail developer has approached a number of undisclosed agencies with a view to holding a pitch.
The successful agency will produce a new consumer-facing site that will be accessible from both desktop computers and mobile handsets.
The site will be non-transactional and will seek to position the new Stratford City mall, set to launch before the 2012 Olympics, as the next iconic shopping mall.
Westfield's most recent development, a £1.6 billion mall in White City, opened in October, supported by an above-the-line campaign created by Adam & Eve.
The agency, which secured the business in March, produced a TV spot featuring moth-like people flying towards the mall.
The Stratford City mall will lie between Stratford city centre and East London's Olympic Park, and will house retail, entertainment, dining and leisure facilities.
This article was first published on Campaign