"The Manchester move was okay. I was still in England and I knew I could go back home. It was a bit further away but I could see the family every three weeks or so.
"Settling there was not a problem," he said at an appearance with Head and Shoulders.
"[Dortmund] have a good history of playing young players. I believed what they said. Christian Pulisic was there – he was 18 at the time and was starting every week. I felt I could compete with him."