The Great British Menu finalist will launch his new venture at the Red Roaster coffee house in the city’s Kemptown area next year.
The site will continue to act as a coffee shop during the day, before transforming in to the Pike and Pine restaurant at night.
Gillan said in a statement that he would be maintaining the ‘passion, enthusiasm and knowledge’ of the ‘Brighton institution’ that has served coffee in the south coast city for the last 16 years.
“[We will] add an unbelievable world class food offer alongside it and transform Red Roaster in to our modern day interpretation of a coffee shop,” the chef wrote on his Facebook page.
"At Pike and Pine the food will very much be along the lines of what I have been known for over the last few years, but still continuing on a journey of discovery and learning, delivering a truly unique food offer for the city.
“The end result will be amazing and I can’t wait to share more with you.”
Gillan spent a decade cooking at The Pass restaurant at South Lodge in Horsham which saw him hold a Michelin Star for five years.
He left the restaurant in April this year and has since run a series of pop-ups at Lucky Beach on Brighton seafront.
Further details of Pike and Pine will be released in the run up to the opening.
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