Marks and Spencer has said its finance and strategy chief Eoin Tonge will be leaving the company to take up a new role at Primark-owner Associated British Foods.
The move comes after a series of top management changes.
Last month, M&S named Alex Freudmann, former managing director of Australian beer, wine, and spirits retailer Dan Murphy's as its new food boss, succeeding Stuart Machin, who was promoted to group chief executive in May.
Tonge is leaving more than two years after joining the British retailer, and Marks and Spencer said it was commencing a process to appoint a successor.
The 138-year-old clothing and food company had said it will end its franchise agreement in Russia in the coming months and joined rivals in warning about the outlook for the current year amid a worsening cost-of-living crunch.