The company previously invited six agencies including several local shops to pitch for the business.
According to reports, the first round of the pitch concluded in June and the presentations for the final round were held in the last week of July.
Reports also suggest that the key focus for the new resort would be the burgeoning India and China markets.
Marina Bay Sands is an affiliate of Las Vegas Sands Corporation. It is being developed as a destination for shoppers across the world, with a mix of emerging labels and international luxury brands, as well as innovative entertainment options including boat rides along the canal flowing through the mall and an indoor ice-skating rink.