The Belgium goalkeeper was the victor of the Golden Glove award at the Russian Federation 2018 Fifa World Cup.
But Courtois isn't getting over-confident. That's how it should be.
With fierce competition for places at Real Madrid, Kovacic has more often than not featured off the bench during his time at the Bernabeu.
Report after report has surfaced over Courtois' exit, with stories going as far to say that a fee had been agreed between Chelsea and Real Madrid for the Belgian. I just want to be myself, the same as I've always been, and try to give my best for the club.
Real are conscious of the need for more firepower up front, but their most pressing concern is in midfield with Luka Modric desperate to leave the club.
Kepa is Spain's number two behind Manchester United's David de Gea and has one worldwide cap.
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Chelsea have confirmed the club's record signing of Athletic Bilbao goalkeeper, Kepa Arrizabalaga. Madrid was also linked to Brazil goalkeeper Alisson, who ended transferring from Roma to Liverpool. "He was deemed good enough by the board and (former manager) Zinedine Zidane to be good enough for Real Madrid, but they wouldn't pay the clause".
Champions Manchester City did make one signing, with 19-year-old midfielder Daniel Arzani being signed from Melbourne City.
According to Spanish media, Navas said he is not anxious about Courtois' arrival, while the Belgian is welcoming the competition.
But he insisted he won't be fazed by the attention of being the world's most expensive stopper or a change of culture in moving to the Premier League. "Mine was because of Iker Casillas, who at his [young] age faced a challenge as great as being Madrid goalkeeper. I come in with absolute respect and to compete at the top level".
The goalkeeper shouted insults about Madrid fans following Atletico's Copa del Rey success in 2013 and cemented himself as a fan favourite before returning to parent club, Chelsea.