Chelsea have completed the signing of highly-rated midfielder Kevin de Bruyne from Genk, the Belgian club have announced.
The 20-year-old has signed a five-and-a-half-year deal and will remain at the Belgian champions on loan until the end of the season.
De Bruyne, who is predominantly a left-sided player, has been on Chelsea's radar for some time and has played twice against the London club in this year's Champions League group stages.
A statement on Genk's website read: "The transfer of Kevin De Bruyne to Chelsea has been completed. He has signed for five and a half seasons and will continue (playing with) Genk until June.
"His signature was confirmed at 0.30 last night. De Bruyne and his agent will return back today from London, along with general director Dirk Degraen.
"Genk will hold a press conference with (director) Jacob Gunther and Dirk Degraen in which they will clarify the transfer policy. Afterwards, Kevin De Bruyne will also give an explanation about his transfer to the English club."
De Bruyne could not hide his delight at securing a move to Stamford Bridge, telling the club's website: "Three years ago I was playing with the young guys in Genk, but now I am making a transfer to Chelsea. It's almost impossible - a real dream come true.
"To come to a team like Chelsea is a dream but now it's a reality and I have to work hard to achieve the level that's necessary.
"It's a few steps (up). Chelsea is one of the biggest clubs in the world and if you see the level they have compared to Genk then it is a real difference but it's something I want to achieve and I will work very hard to get there."
Meanwhile, Chelsea also confirmed that 18-year-old Austrian youth international Philipp Prosenik has joined AC Milan on a permanent deal. The midfielder arrived at the Blues from Rapid Vienna in 2009 but did not make a first-team appearance at the club.