Courtois said at his official unveiling: "Arriving at the best club in the world is a responsibility and an honour".
Champions League-winning goalkeeper Keylor Navas is hell-bent on staying at Real Madrid despite the arrival of Thibaut Courtois.
However there is no clause in the deal that would permit Chelsea to automatically buy Kovacic, a Croatia global, next summer.
Courtois has passed a medical in the Spanish capital and put pen to paper on a six-year contract.
Explaining the reasons for his move, the Golden Glove victor at World Cup 2018 said: "I wanted to be closer to my family".
Here's a clear look at the Google Pixel 3 XL
The Android 9 Pie release is the proof in the proverbial pudding that Android as an operating system has hit its stride. The exceedingly tall notch at the top also seems to stretch the status bar with vertically centered icons.
As displayed by Manchester City's Ederson, whose previous world record fee now looks like a bargain, a keeper that can be composed under pressure and deliver smart passes is a huge advantage to have in the Premier League.
Kepa had been with Athletic since 2004, rising through the youth ranks.
"It's been a very important decision for me", he said.
Arrizabalaga becomes the most expensive goalkeeper in soccer history, ahead of Liverpool's Alisson, who moved from AS Roma for €75 million earlier in the transfer window.
"The Croatian midfielder joined Marcelo, Varane, Casemiro and Kovacic, who did individual work in the gym".