Corbin & King, which operates sites including the Wolseley, the Delaunay and Brasserie Zedel, is to open a new site in St John's Wood, north-west London, later this year.
He that the currently unnamed site would be "Colbert meets Fischer's" and would follow those brands' neighbourhood restaurant style, but with its own identity.
He continued: "I will certainly let you know more as we proceed and reassure you that it will be 'bespoke' and not the beginning of a chain."
Corbin & King are also due to open Café Wolseley at Bicester in June, a "hybrid" of the Wolseley featuring a takeaway counter and shop.
King also announced the appointment of Adam Middleton as head chef of Colbert in Sloane Square and South African born Dalmaine Blignaut as head chef of Bellanger, Islington.
Chris Corbin and Jeremy King, who were ranked eighth in The Caterer's Top 100 most powerful people in hospitality, joined forces in 1981 to acquire Le Caprice. The Ivy followed in 1990 and seafood restaurant J Sheekey in 1998. In the same year Caprice Holdings was sold and Corbin & King remained as non-executive directors until 2002.
They returned in 2003 with the acquisition of the Wolseley followed by Colbert, Brasserie Zédel, the Delauney, Fischer's and Bellanger, all in London. They opened their first hotel, the Beaumont, in 2014.
Last year, Thai-based Minor Hotels paid £58m for a majority shareholding in Corbin & King to enable the business to expand across the UK and throughout Minor's 150-strong hotel portfolio.