Tesco chief executive Dave Lewis has not ruled out submitting concerns about the Sainsbury’s-Asda merger to the Competition and Markets Authority.

Speaking on a call about the supermarket’s quarterly results, Mr Lewis confirmed Tesco would make a submission if asked, but declined to comment further. 

He added delivery times for Booker retailers in Manchester and the South West have improved as a result of the wholesaler’s merger with Tesco. 

“Tesco’s Magor depot in South Wales is now stocking 3,000 Booker lines, while the Middleton warehouse in Manchester is set to help meet the summer trading period,” he said.

Booker’s like-for-like sales rose 14.3% in its first quarter under Tesco’s ownership.

Read more: CMA opens investigation into Sainsbury's proposed Asda takeover