Two of Britain’s grocers are in talks to merge, potentially creating the country’s biggest supermarket operator amid continued upheaval in the retail industry.

In a statement on Saturday, the chain J Sainsbury confirmed news reports about its talks to combine with Walmart’s Asda supermarket business in Britain, adding that it planned to make an announcement on Monday morning. It is unclear how much of a stake Walmart would retain in a potential transaction.

The move reflects how retailers have been forced to cast about for ways to deal with a rapidly changing retail industry. In Britain alone, chains like the electronics store Maplin and the department store BHS have filed for bankruptcy in recent years.

Amazon remains a huge threat, through both its online operations and its growing brick-and-mortar presence, with Whole Foods Market. And in the grocery sector, low-cost chains like Aldi and Lidl have lured British customers away from traditional competitors like Sainsbury, Tesco, Asda and Morrisons.