Italian restaurant chain Prezzo is preparing to close around 100 of its 300 stores in an attempt to rescue the business, the BBC understands.
The chain – which is owned by private equity firm TPG Capital – employs around 4,500 people.
Prezzo is also expected to completely close its TexMex chain Chimichanga, which has 33 restaurants in the UK.
The closures would form part of a deal to renegotiate debts owed by the company to its landlords.
Specialist restructuring firm AlixPartners is understood to be drafting a company voluntary arrangement (CVA) – a step short of going into administration – on the company's behalf.
The CVA would allow Prezzo to continue trading without being pursued for the money it owes.
The situation means that hundreds of jobs are hanging in the balance, but the firm is expected to redeploy staff if it can.
Prezzo was bought by TPG in 2014 for just over £300m.
Burger chain Byron and Jamie's Italian have both had to undergo similar restructurings this year, agreeing rescue plans with their lenders and landlords, and closing restaurants.
Barbecoa, a smaller business owned by Jamie Oliver, went into administration earlier this month.
Analysts have said fears over the strength of the UK economy have meant consumers have cut back on discretionary spending.
Last year, consumer spending fell for the first time since 2012, according to payments processor Visa.
Wages have also been rising at a slower pace than inflation, leaving consumers worse off.
The restaurant sector has also faced higher costs for the ingredients it buys overseas due to the drop in the pound since the UK voted to leave the European Union.