Kovacic told the club’s official website: “I am really happy and excited to be here at Chelsea. It is an amazing feeling.
“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 also remarked: “We are very happy to welcome Mateo to the Chelsea family. 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.”