Kepa Arrizabalaga: A new twist in the career of the world's most expensive goalkeeper as he faces Bournemouth

The arrival of the world's most expensive goalkeeper has sparked much interest, particularly due to the intriguing career of Kepa Arrizabalaga taking another unexpected twist.

He was supposed to be "a big part of any success Chelsea have in the coming years," according to Marina Granovskaia when the London side splashed £71.6m on him in the summer of 2018, smashing the record fee for a keeper which had been set by Liverpool with Alisson just weeks earlier.

The seven-year contract handed to Kepa was a rarity back in those days but underlined the belief Chelsea had in him. The 23-year-old seemed like a sure thing.

He certainly didn't lack belief in his own level at that time, infamously refusing to be substituted by Maurizio Sarri the following February during extra-time of Chelsea's penalty shootout loss to Man City in the Carabao Cup final at Wembley.

An apology and fine followed, with Kepa briefly dropped for Chelsea's next league game, but his status as No 1 was swiftly reaffirmed by Sarri and a couple of penalty saves in the Europa League semi-final helped the Blues towards a triumph in that competition at the end of his first campaign in west London.

But then Kepa's form turned. With Sarri gone and Frank Lampard brought in, Kepa's second season at Stamford Bridge was a poor one statistically: he let in 11 goals more than he would be expected to, according to the data. It was an alarming figure.

Noticeably vulnerable to shots from outside the box, his save percentage was just 53.47 per cent - the worst figure recorded by any Premier League regular that season.

"He makes far too many mistakes," said ' Gary Neville at the start of the next season, when two errors in two games from Kepa saw him replaced by the Petr Cech-recommended Edouard Mendy.

Two seasons largely on the sidelines followed, with Kepa left to watch on as Mendy helped Chelsea to Champions League glory under Thomas Tuchel.

There was a morale-boosting cameo in the subsequent Super Cup win over Villarreal, when Kepa came on as a late sub for Mendy to save two penalties in the shootout - although his deployment as a shootout specialist backfired in the Carabao Cup final later that season when he failed to stop a single Liverpool penalty and then missed his own in the 11-10 defeat.

A revival came under Graham Potter, with Kepa capitalising on a dip from Mendy and making the save of the 2022/23 season against Aston Villa, but Chelsea's hierarchy - now financed by Clearlake Capital and Todd Boehly - weren't convinced and signed Robert Sanchez as their next No 1, loaning Kepa to Real Madrid.

After the positive steps of the previous season, Kepa stumbled again. Real Madrid signed Kepa to cover for the injured Thibaut Courtois - who he had been bought in to replace at Chelsea initially - but he underwhelmed and lost his starting spot to Andriy Lunin, who he was sat alongside when Courtois made his comeback in time for the Champions League final triumph in June.

Another frustrating season finished with Kepa unsurprisingly left out of Spain's squad for their Euro 2024 win - he has just 13 caps.

With no clear route back at Chelsea for the foreseeable future, Kepa found himself badly in need of a reboot this summer.

Enter Bournemouth with the offer of a season-long loan to the south coast. A renegotiated contract with Chelsea saw Kepa accept a reduction in his hefty salary for a short extension and the opportunity to return to the Premier League. The Vitality Stadium may have been an unlikely destination but Bournemouth is a club with a familiar manager for Kepa.

The goalkeeper came through the ranks at Athletic Bilbao while Andoni Iraola was captaining the Basque side. Their career paths didn't see them play in the same team but they did train together and their connection was a key element to one of the window's most eye-raising deals being done.

There were flashes of Kepa at his best during his dramatic debut win at Everton, saving sharply to keep out Iliman Ndiaye and Seamus Coleman from close range. That will have been encouragement for those Bournemouth fans watching on and wondering what they will get from their new No 1. They aren't the only observers asking that question.

Kepa will be back on the sidelines, unable to face his former club, when Chelsea come to the Vitality on Saturday night. But where his story goes next will be a fascinating storyline to follow this season.

Watch Bournemouth vs Chelsea live on Premier League on Saturday; kick-off 8pm