Antonio Rudiger joined Chelsea from Italian club Roma for a reported fee of £29 million, the buying club announced on Sunday.
The 24-year-old – whose fee with add-ons could rise to £33.3m – signed a five-year contract a week after helping his country win the Confederations Cup.
Rudiger, who had been with Roma since joining from Stuttgart in 2015, provides a boost for Chelsea a day after they suffered the bitter disappointment of seeing striker Romelu Lukaku, their main transfer target of the close season, agree to join Manchester United instead.
“It’s a great feeling because not every player has the opportunity to join a huge club like this,” Rudiger told the club’s website.
Chelsea technical director Michael Emenalo said Rudiger – who has been capped 17 times since making his debut in 2014 – possessed the qualities to blossom in the Premier League.
“We are pleased to be able to bring in a player of proven quality who adds to our defensive options,” added Emenalo.
“Antonio is still young but is experienced at club and international level and possesses all the requisite attributes to thrive in the Premier League.
“We have been aware of him for some time and we are confident he will fit in well with the squad.”
Rudiger, who has scored 12 goals in his professional career but also picked up six red cards, is Chelsea’s second signing of the close season though the first to cost any money.
“I am looking forward to meeting up with my new teammates and I’m very proud to officially become a Chelsea player.”