He left for the Amex Stadium as part of the £62m deal that saw Marc Cucurella join Chelsea last summer, making 15 appearances.
They hope to offer Colwill European football, with Champions League football still in reach for Roberto De Zerbi’s side.
But Chelsea’s plan to keep him at the club next term is clear, and a guarantee of regular football would go a long way in tying him down to an extension.
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