Morris was believed to be on the verge of joining other Lowe colleagues, including former chairman Paul Weinberger and creatives Sam Cartmell and Jason Lawes, at Sir Frank's unnamed agency, which has poached the £45m Tesco account from Lowe.
However, Lowe confirmed yesterday that Morris would remain, hinting that his name could go above the door and that he could take an equity stake in the agency.
Tony Wright, president and CEO of Lowe Worldwide, said: "Ed is obviously a key part of our offering in London and an absolutely unique talent.
"The next generation of Lowe London will involve a small number of senior managers having a significant stake in the direction of the agency; this will also be reflected in our branding strategy for Lowe London and other key network offices."
He added that the agency would be revealing a number of changes in the next few weeks that would take it in to "the heart of a new world in which clients and consumers operate".
Lowe's parent company, the Interpublic Group, has taken steps against Sir Frank to stop him using what it claims is confidential information to lure staff and clients to his start-up.
This includes insisting that all Lowe staff who quit are held to their full notice period -- including a year's gardening leave for Weinberger.
Sir Frank has responded with his own legal threat, accusing Interpublic of defamation.
As well as luring a number of Lowe staff to his new venture, Sir Frank is to be joined by two senior executives from DDB London: Paul Hammersley, former chief executive; and David Hackworthy, who was chief strategic officer.
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