(Bloomberg) -- Kroger Co. and Albertsons Cos. agreed to divest more stores to C&S Wholesale Grocers, seeking to make their planned $24.6 billion merger more appealing to antitrust authorities.

The supermarket chains had agreed in September to sell 413 locations to C&S and have boosted the figure to 579, they said Monday.

The US Federal Trade Commission, eight states and Washington, DC, sued in February to block the proposed deal, arguing the tie-up would lead to higher prices for groceries and lower wages for workers.

The expanded divestiture plan “addresses concerns raised by regulators, and will further ensure that C&S can successfully operate the divested stores as they are operated today,” Kroger Chief Executive Officer Rodney McMullen said in the companies’ statement.

The companies continue to promise that no stores will close as a result of the merger and all front-line workers will remain employed, McMullen said.

Under the new proposal, Kroger and Albertsons will sell 101 Arizona stores to C&S, up from 24 under the prior plan. In Washington state, they’ll sell 124, up from 104. In Colorado, it’s now 91 stores, up from 52. In Illinois, the number of stores being sold rises to 35 from 14. In Oregon, it rises to 62 from 49. California sees a decrease in planned sales, to 63 from 66.

Kroger shares were unchanged in premarket trading Monday. Albertsons rose 0.7%.

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