#2 Alvaro Morata - £70m (2017 - 2019)
Chelsea's most expensive player of all time - It all started so well for the former Real Madrid man, with him getting a goal and an assist on his Premier League debut for the club as well as a hat-trick within one month of being a Chelsea player.
However, it all began to go downhill from there as Alvaro Morata struggled for form in front of goal, enduring multiple goal droughts, with Chelsea seeking a replacement for him (in the form of Olivier Giroud) barely six months after his £70m arrival.
The player had departed Real Madrid over a lack of playing time, but despite being granted numerous opportunities as a starter for Chelsea, he failed to take his chances and soon found himself out of the first-team picture.
The arrival of Maurizio Sarri in the dugout for Chelsea did little to improve Morata's fortunes, with the Italian manager publicly questioning Morata's mentality and the height of his distrust in the Spaniard being manifested in his preference of Hazard in the false nine role than starting Morata.
The 26-year-old faced numerous justified criticism for his non-physicality to the English game, as well as his profligacy in front of goal and his one and half year stay at Chelsea yielded just 24 goals from 72 matches in all competitions.
Contrary to popular opinions, Morata has never been a prolific scorer (even at Juventus) where he scored just 15 goals in 63 Serie A matches across two seasons (despite playing mostly as a starter).
He has seemingly ended his Chelsea misery with a loan to Atletico Madrid and how that pans out for him is yet to be seen.