The 22-year-old Algerian forward, who was the Hornets´ top scorer last season with seven goals, has signed a four-year deal and the Cottagers will make an initial payment of £3million with a further £1million based on appearances and divisional status.
Watford manager Adrian Boothroyd told the club´s official website: "We´re disappointed to lose him because I wanted to keep him in the squad for this season. Sometimes though you have to weigh up the money on offer and the value a player brings to the squad who wouldn´t necessarily be starting each and every week."
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