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Ahmen Elmohamady is on his way to the Stadium of Light.
Sunderland have completed the signing of the Egyptian International on a permanent deal.
The winger, who can also play at right-back, spent last season on loan at the Stadium of Light from ENPPI in a deal which included an option for Sunderland to buy him outright.
That clause has now been exercised and the 23-year-old has joined on a pre-arranged undisclosed fee having signed a three-year contract.