Modric, awarded the Golden Ball as best player at the World Cup, was given a break rather than join Real's pre-season tour of the United States, as were another Croatian World Cup finalist, Mateo Kovacic, who was reported to have travelled to London to join Chelsea, French World Cup victor Raphael Varane and Brazilian duo Marcelo and Casemiro.
But it is Chelsea's move to replace their first-choice goalkeeper that is most eye-catching.
When asked about playing under new Chelsea boss Maurizio Sarri, Kepa added: "I find his style and ideas very attractive".
Madrid's starting goalkeeper has been Keylor Navas, who helped the club win the last three Champions League titles.
Kepa's deal eclipsed the 72.5 million euros Liverpool paid Roma to make Alisson Becker the world's most expensive goalkeeper in July.
"It's an accumulation of things, and I am very glad Chelsea has made a decision to trust me and to take me in as well".
Chelsea director Marina Granovskaia has described Mateo Kovacic's playing style as a "perfect fit" for the Premier League side.
Courtois will sign a six-year contract at the Bernabeu subject to agreeing personal terms and passing a medical.
The seven-year deal certainly puts Chelsea in a position of strength which had been lacking with outgoing Courtois.