Timo Werner has already greeted Kai Havertz as a Chelsea player after the midfielder joined the Blues on Friday night.
The 21-year-old flew in from the Germany national squad after their match against Spain in the Nations League.
It marks a brilliant coup for the Stamford Bridge outfit, who were initially quoted £90m from Bayer Leverkusen.
Instead, Blues chief Marina Granovskaia has whittled down the price by over £20m.
The youngster becomes the sixth new player at Chelsea this summer after the arrivals of Werner, Hakim Ziyech, Ben Chilwell, Thiago Silva and Malang Sarr.
And Havertz, the second German to join the Blues this summer, has already been greeted into the first-team at Stamford Bridge by his compatriot.
Werner tweeted out a picture of the two on international duty, with the caption: "Welcome to Chelsea, my friend!"
After being released from international duty, Joachim Low all but gave away his impending move after stating that he was doing everything in his power to prevent a deal collapsing.
He said: “[We] didn’t want to take another risk that something could be endangered in this deal.
"There is the problem that if he has signed the contract and enters Switzerland, he may have to be in quarantine.
“We knew that the last details would be clarified today and tomorrow with his contract with Chelsea. The player was a bit torn.
"On the one hand, he wanted to join the national team. On the other hand, he absolutely wants to take this step.
“Of course, we also know about the importance and magnitude [of the move]. That is of course a huge story."
And Havertz was over the moon to complete a move to west London, saying: "I am very happy and proud to be here.
"For me it is a dream come true to play in a big club like Chelsea and I can’t wait to meet all the players and the trainers. Yeah, I am very happy to be here!"