#3. Alvaro Morata - Chelsea

Alvaro Morata was signed by Chelsea from Real Madrid for a reported £60 million, making him the Premier League outfit's club-record signing back then.
Signed in 2017, Morata arrived with plenty of hype and never justified it. The Spaniard was described as a prolific goalscorer from his time at Real Madrid and Juventus. He even received high praise from his former managers and was expected to replicate his goalscoring form.
Chelsea finished a respectable third in the Premier League during Morata's second season with the club. But it became overwhelmingly clear that the forward didn't have a future with the Blues. Morata scored just 16 Premier League goals during his two seasons with Chelsea, spanning 47 games.
Although he did win the FA Cup and the UEFA Europa League, Morata was never considered a key contributor to these successes. Chelsea decided that a replacement was required and eventually sold him in 2019 to Atletico Madrid for £58 million.
#2. Paul Pogba - Manchester United

Paul Pogba became the Premier League's most expensive transfer of all-time when Manchester United signed him in 2016.
Arriving for a reported £94.50 million, the Frenchman also became the world's most expensive transfer at the time. Pogba has continued to divide opinion among the Red Devils' fanbase with his performances since returning to the Premier League.
The 28-year-old was expected to be the box-to-box midfielder that United were missing. Pogba also arrived on the back of a couple of excellent seasons with Juventus. This made many United fans believe he would be the one to take them back to their glory days.
Having spent five years with the club now, it is fair to say that Pogba's spell with the Red Devils has been underwhelming. The midfielder has little to show from his time at the club and has been excessively inconsistent in his time at Old Trafford.
Pogba's talent has always been there for everyone to see. He won the FIFA World Cup with France while he was at Manchester United, even scoring a goal in the final. But he has only managed to win the UEFA Europa League with United in 2017 and has not done much for the Premier League outfit otherwise.
Considering his price tag and the sky-high expectations when he arrived, Pogba is justifiably second on this list of Premier League signings who have failed to live up to the hype.
#1. Kepa Arrizabalaga - Chelsea

Kepa Arrizabalaga was signed by Chelsea in 2018 for a reported £71.6 million from Athletic Bilbao. The fee made him the world's most expensive goalkeeper of all time.
Although a fairly unknown entity to English football fans at the time, Kepa arrived in the Premier League with massive expectations. Chelsea had just lost Thibaut Courtois, who departed for Real Madrid, and Kepa was expected to fill his shoes in goal. Many hoped the Spaniard would become the keeper the Blues needed to win major trophies again.
But Kepa's tenure at Stamford Bridge has been largely underwhelming. After a decent start, he has been involved in several incidents that have pushed him out of favor at Chelsea. His refusal to be substituted against Manchester City in the EFL Cup final is a significant example, while his numerous blunders in goal have become the theme of his time with the Premier League side.
To his credit, Kepa did win the UEFA Europa League with Chelsea in 2018. But he has consistently fallen down the pecking order since. The following year saw Kepa benched for several games, with the Premier League outfit preferring to play 38-year-old goalkeeper Willy Caballero over their marquee signing.
His poor run culminated with Chelsea's signing of Edouard Mendy, who went on to replace Kepa permanently in goal. Commonly described as a panic signing, Kepa made only seven Premier League appearances last season. He technically did win the UEFA Champions League in the 2020-21 season, but made only one appearance during Chelsea's victorious campaign.
It remains to be seen if Kepa can redeem himself with another club as he is reportedly on Chelsea's departure list. Still only 26, the Spaniard certainly has several years left in his career.