But, in freakish circumstances, Chelsea did not include a clause in the Kovacic contract which would enable them to make the deal a permanent one if the Croatian global impresses in the Premier League.
Chelsea added in a statement that subjects to the completion of the Courtois deal, Croatian midfielder Mateo Kovacic would join the Blues from Real on a season-long loan.
'He said the Premier League will be tough in the beginning but he said it is a nice League, the stadiums are always full and I will enjoy it.More news: Dubai tourist runs up $65,000 in speeding fines driving supercar
United midfielder Paul Pogba has been linked with a blockbuster switch to Barcelona after the France World Cup victor reportedly grew frustrated with perceived criticism from Mourinho.
Kepa is Spain's number two behind Manchester United's David de Gea.
Courtois had been preparing to enter into the final year of his deal at Chelsea, with no extension put in place.
Chelsea are expected to sign Athletic Bilbao goalkeeper Kepa Arrizabalaga as Courtois' replacement at Stamford Bridge. Considered Spain's goalkeeper of the future, he was a reserve at the World Cup in Russian Federation.More news: Official death toll still 131 in Indonesia quake
Kepa's deal eclipsed the 72.5 million euros Liverpool paid Roma to make Alisson Becker the world's most expensive goalkeeper in July.
"So many things attracted me to the club - all the titles the club has won, the other players, the city, the English Premier League", Kepa said.
Sarri is also getting Kovacic, who had not played much with Madrid since joining the club in 2015 and had been seeking a transfer.More news: Spreaker Removes Alex Jones Podcasts
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