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Deulofeu initially joined Watford on loan in January 2018 from Barcelona before the move was made permanent in the 2018-2019 season. During his time at Watford, Deulofeu made a significant impact with his pace, dribbling, and goal-scoring abilities, becoming a fan favorite at Vicarage Road. Overall, he made 87 appearances for the club, scoring 18 goals and providing 14 assists before departing in 2020.