The 20-year-old spent the second half of last season on loan with the club, and now returns for the full season.
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The Malian midfielder joined United in August 2024 from Guidars FC in his homeland.
During the 2024/25, Kone made 12 appearances for United in Premier League 2, scoring twice while providing two assists.
United still believe Kone has a big future at the club, and will continue his development in Switzerland for the coming season.