At least 73 supermarkets will have to be sold in order for Sainsbury's proposed Merger with Asda to be given the go-ahead, according to new research.
The new supermarket group would become the largest in the UK by market share.
The £15bn deal is set to face huge scrutiny by the Competition and Markets Authority (CMA). regulator.
It's the CMA's job to prevent companies becoming too dominant and harmful to consumers.
If the CMA approves this merger, then many expect both chains to have to give up a number of stores.