The owner of Wagamama and Frankie & Benny's says one in 10 of its restaurants and pubs will stay closed into next year.
The Restaurant Group customers are unlikely to return in large enough numbers to make some of its venues worthwhile. A large number of the closed sites will be in airports, it added.
By the end of September the group expects that 90% of its sites will have opened, while 60% will have restarted by the end of August and 25% by the end of July.
The Restaurant Group will be left with about 400 restaurants after a restructuring which last month saw it announce the permanent closure of 125 Frankie & Benny's sites.
"The group has now started a phased reopening of its restaurants and pubs for eat-in trade in line with Government guidance," it said in a statement to investors.
"We are very pleased to be able to welcome back our customers and colleagues ensuring that their safety is paramount, whilst maintaining an enjoyable experience.
"The diversified portfolio of the group allows each division to adapt to the challenges of social distancing uniquely, whilst keeping the customer at the heart of every decision."
