Wal-Mart is restructuring the senior leadership of its vast US operations, as the retail giant's new chief executive continues to build his own core management team.

An internal memo reveals that Wal-Mart US Chief Operating Officer Kieran Shanahan will step down from his role this week. The 45-year-old Shanahan will be succeeded by Kyle Kinnaird, the current Chief Operating Officer of Wal-Mart International.

In recent months, the Bentonville, Arkansas-based company has seen several senior executives depart. These include Tom Ward, Chief Operating Officer of the warehouse club chain Sam's Club, and Cedric Clark, who left his position as head of US store operations for Wal-Mart in May. Clark's role remains unfilled.

These personnel changes follow the appointment earlier this year of John Furner as the company's global CEO. Furner is a long-time Wal-Mart veteran with deep roots in Arkansas, now holding the top leadership position. Wal-Mart has also appointed new CEOs and key executives for its three core business segments: US operations, International operations, and Sam's Club.

The memo indicates that Shanahan began his career nearly three decades ago at Asda, then a UK subsidiary of Wal-Mart. He will not leave the company immediately but will stay on in an advisory capacity until the end of Wal-Mart's fiscal year, on January 31, 2027.

The 47-year-old Kinnaird joined Wal-Mart over two decades ago, initially working at Sam's Club. Like Furner, he is a graduate of the University of Arkansas with a degree in marketing.

Wal-Mart announced that another executive, Juan Galarraga, will take over some of Kinnaird's former responsibilities in the international business.

While Wal-Mart has posted strong quarterly sales for years, some investors have recently expressed concern that an impending grocery price war could erode profits. Earlier this month, Wal-Mart announced price cuts on thousands of items, following similar discount moves by other retailers like Kroger in recent weeks.