Real Madrid confirmed Courtois will undergo a medical on Thursday morning before signing a six-year deal.
"All I'd like to do is to thank the fans for the last four years and for how they've supported me at Chelsea", he added.
The two clubs reached a deal reportedly worth 80 million euros and the 23-year-old Spaniard signed a seven-year contract with the 2017 English Premier League champion.
Kepa has signed a seven-year contract that commits him to Chelsea until his 30th birthday, and he has high aspirations for his time at Stamford Bridge. He signed a fresh deal that would keep him at the club until 2025, with his release clause raised to €80m - describing Bilbao as his "home" and the club he believed he would develop the best at.
"I had excellent references from them about the club, knowing them and being able to talk to them has been a great support for me over the last few days", he told Chelsea's official app, The 5th Stand. Everyone just said congrats and they gave me a fake World Cup and they put it above my locker.
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Sanchez had previously played in England with Aston Villa and he said: "I always maintained the same desire to return and here I am, with the same mission, with the same desire and dream".
As well as showing he is capable of dominating his area and making spectacular saves, playing for Maurizio Sarri means Kepa will have to show he is adept with the ball at his feet. "I find Sarri's style and ideas very attractive".
"For him this is a personal situation and I don't know what he'll decide, but I would like [him to stay]". He was very happy with him.
The Belgian World Cup goalkeeper had made no secret of his wish to move to the Bernabeu, because he wanted to be nearer his two children who both live in Spain. It is great to see fees for strikers, but why not goalkeepers? It has to do with many things. It's a good way to acknowledge a good goalkeeper.