An offer of £8m was accepted by Norwich City last week.
The Carrow Road club will hope that the arrival of Kyle Lafferty for an undisclosed fee will help offset the Scot's departure, with the former Rangers striker expected to complete a move today. Lafferty spent last season with Palermo but is excited to return to English football.
"I'm excited to come here and start playing football for a team like this," he said, who left Ibrox two years ago. "I can't wait to get started."