The goalkeeper joins the Ligue 2 side permanently for an undisclosed fee after spending 18 months at the Stadium of Light. He joined the Black Cats from Stoke City on a free transfer.
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Sunderland chief Kristjaan Speakman: “Blondy has been progressing well and has been a core part of our senior squad.
"His role in the group has been vital, but looking forward, we need to provide him with the opportunity to take his development into professional games.
"This is a great opportunity for him, and we wish him well.”