The 19-year-old winger has agreed a three-year contract at Turf Moor and becomes the club’s first addition of the 2026 summer transfer window.
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Born in Barcelona, Castell began his career at Gimnastic de Tarragona before joining Espanyol’s academy in 2022.
He progressed through the club’s youth ranks, earned a professional contract in 2024 and made more than 60 appearances for Espanyol B, scoring 11 goals.
After impressing in training with the senior squad, Castell made his first-team debut against Real Sociedad in May. Burnley believe the talented forward has a bright future ahead.