The Egyptian, who joined the Tigers temporarily at the end of August, had impressed during his time on loan at the KC stadium but returns to the Black Cats, who were only able to name six substitutes against Bolton in the FA Cup on Tuesday evening.
A statement from Hull read: "We would like to thank Elmo for his efforts and wish him all the best for the future."
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He featured 23 times for Hull as Steve Bruce's team battle for automatic promotion back to the Premier League, with his only goal for the club coming in a 3-2 win over Leeds United back in September.