Ahmed Elmohamady has completed his permanent move to Sunderland.
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.
The 23-year-old has joined on a pre-arranged undisclosed fee having signed a three-year contract.