Chelsea have completed the signing of Mateo Kovacic from Real Madrid on a season-long loan.
The 24-year-old moves to London as part of the deal that takes Thibaut Courtois to the Bernabeu.
Midfielder Kovacic, 24, has been at Real for three seasons since joining from Inter Milan and helped Croatia reach the final of this summer's World Cup in Russia.
"I am really happy and excited to be here. It is an amazing feeling," Kovacic told Chelsea's website.
"I will try to do my best for this club. It is a new league for me, the beginning is always tough but I am sure the coach and my new team-mates will help me and I am looking forward to a great season."
Chelsea director Marina Granovskaia added: "He is a perfect fit for us this season, his style is well suited to how Maurizio wants to play and we are sure he will prove to be a valuable asset for the club."