CHELSEA have confirmed the signing of Jamie Gittens from Borussia Dortmund for £52million.The English winger becomes the Blues’ SEVENTH summer addition.Chelsea have signed Jamie Gittens in a £52million deal from Borussia DortmundGettyBut he will be unable to play for them in the Club World Cup after Chelsea booked their spot in the semis.THIS IS A DEVELOPING STORY..The Sun is your go to destination for the best football, boxing and MMA news, real-life stories, jaw-dropping pictures and must-see video.Like us on Facebook at https://www.facebook.com/TheSunFootball and follow us from our main Twitter account at @TheSunFootball.