The former Borussia Dortmund winger could retain the only shirt number he has ever worn during his club career.

Chelsea has completed the signing of English winger Jamie Gittens from Borussia Dortmund for a reported initial fee of 48.5 million pounds ($66 million).

"It feels very full circle," Gittens told the club's website. "I was at Chelsea when I was at Under-8 or Under-9 level, around that time. I wasn’t there for long, but I remember going to Chelsea and being so excited to come back from school to join Chelsea for two hours, once a week. It was a great feeling.