The seven-year deal certainly puts Chelsea in a position of strength which had been lacking with outgoing Courtois.
Colombia centre-back Mina would be signing on a permanent deal for a fee of around £27m while Portugal global Gomes would move on a season-long loan for a fee of around £2m.
Athletic confirmed on Wednesday that the 23-year-old's release clause of 80million euros (£71m) was activated and his contract terminated, although made no mention of Chelsea.
Arrizabalaga becomes the most expensive goalkeeper in soccer history, ahead of Liverpool's Alisson, who moved from AS Roma for €75 million earlier in the transfer window.
US Police find starving children in New Mexico compound
Siraj Ibn Wahhaj is accused of leaving Georgia in December with his then three-year-old son, and will face court later today. Sheriff Hogrefe said they worked with other agencies and believed that the missing could still be on the compound.
"I am very happy to continue in what I consider my home", Kepa stated at the time.
He replaced Belgian global Thibaut Courtois who was sold to Real Madrid after pleading to be reunited with his family. "I need to do my best to prove myself".
"I think we all know that, when you're a kid, there's always a club that really makes you sit up and take notice".
A video on Real Madrid's official Twitter feed showed Courtois signing his contract alongside club president Florentino Perez.
Infowars' Alex Jones booted from YouTube, Facebook, other services
The Alex Jones YouTube channel had 2.4 million subscribers and its videos were viewed over 1.5 billion times. However, it has admitted that it has no scalable policy or set of features around authenticity of content.
While the deadline for Premier League transfers closed on Thursday evening, clubs in Spain are still free to complete deals until the end of August.
'It's a very important decision for me, for my career, and also for my personal life.
Kepa made the Athletic number-one spot his own after returning from a loan spell with Real Valladolid at the start of the 2016-17 campaign.
He's not wrong. Kovacic is likely to take game time away from encouraging youngsters such as Ruben Loftus-Cheek.
Liverpool's centre back shortage not a problem for Jürgen Klopp
But the No.14 is not taking anything for granted regarding the Premier League opener against West Ham United this Sunday. From there it looked like Torino could be in a night like the one that befell Napoli in the Aviva Stadium last weekend.