Tesco has asked the competition watchdog to fast-track its investigation of the supermarket's merger with Booker Group.
The phase one investigation of the takeover by the Competition and Markets Authority (CMA) started on 30 May, and was due to be completed by 25 July.
If the CMA fast-tracks its investigation it will issue a phase one decision in the next 10 working days, and the more in-depth, phase two investigation will be carried out over the following 24 weeks.
Tesco said in a statement: "We are grateful to the CMA team for the work they have done to date and appreciate the support of customers, suppliers and colleagues during this process."
The £3.7bn merger between Tesco and Booker Group, which is both a supplier and an owner of a handful of convenience store brands, was first announced in January.
However, it is thought that the CMA will require Tesco to close some of its convenience stores as part of its probe.