The 25-year-old has signed a four-year contract that will keep him at the club until 2030.
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Soumare arrives after his contract with Le Havre AC expired, bringing an end to his time at the French side.
The winger enjoyed a productive 2025–2026 campaign, scoring eight goals and registering five assists, form that attracted interest from Rennes.
Known for his pace and attacking flair, he is expected to add depth and creativity to the club’s frontline.