The company, which owns more than 120 European companies including Grattan and LookAgain in the UK, has appointed agency AKQA to revamp its fashion and homeware destinations in time for the Christmas rush.
An email campaign will drive traffic to the site, but there will be no additional online marketing accompanying the re-launches.
John Veichmanis, head of e-commerce at Otto UK, said: "We have a long-standing heritage of developing innovative home shopping services for our customers. I am confident that the collective team will create a truly awesome online shopping experience."
The account will be headed by Matt Bain, head of AKQA's retail practice.
Otto Group's global retail business turned over more than €14bn in the last financial year, and it employs 54,000 people.
In November last year Otto UK hired Unique Digital for a six-figure campaign to push the Freemans and Montage brands online, having appointed the agency to the Kaleidoscope account last month.
The pre-Christmas push focused on search activity and marketing through shopping partners and aggregators.
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