Tesco has seen like-for-like sales fall by 3.7% over the past three months - the third consecutive quarter decline - according to its First Quarter Interim Management Statement 2014/15.
In April the retailer announced a 6% decline in annual profits.
Chief executive Philip Clarke said that he expected trading to “remain challenging for the UK grocery market as a whole” and added that despite today’s results he was pleased with the company’s “accelerated efforts to deliver the most compelling offer for customers.”