While not discussing the status of the transfer, Chelsea coach Maurizio Sarri said that Kepa was "very young, but very, very good".
Is paying a world record fee for a goalkeeper that has only been getting consistent first team action and starts for two seasons ideal? He's amassed a reputation for his sharp reflexes, ability to move quickly on his feet and rapid movement.
Comfortable in either holding midfield or the centre of defence, Martinez won the Champions League in his first season with Bayern and has collected six consecutive Bundesliga titles, although persistent injury problems have plagued his time in Bavaria.
Courtois' actions are set to lead to success and, according to Spanish TV programme El Larguero, Real Madrid are to officially seal the signing of the goalkeeper later this week. Kepa conceded just 22 goals in 23 outings in 2016/17; last season, despite finishing 16th, Athletic shipped fewer than fifth-placed Villarreal. I arrived at Chelsea when (Petr) Cech was there and I ended playing. "I have been here for nearly 15 years, I joined when I was nine". Since I was little I've been an Athletic fan and always will be.
"In terms of the price and me being the most expensive keeper in the world, it's something I don't think about", he said.
It was a hard period for the London club after many headlines generated had to do with their star players leaving.
Kepa could make his Premier League debut against Huddersfield on Saturday after completing a deal that director Marina Granovskaia believes will be great for Chelsea.
Athletic, all along, were only expected to sell should Kepa's buy-out clause be matched.
He already has 46 global appearances to his name since debuting in 2013, and along with playing his part this summer as Croatia entered unchartered territory, he started each of their games at the World Cup in Brazil four years ago.