#3 Timo Werner
Werner arrived in England with a huge reputation, after four stellar seasons for the Bundesliga club.
In 159 appearances, the 25-year old was involved in 135 goals (95 goals and 40 assists). He was also one of the top players for the German side, and all the hype around Werner seemed to make sense. However, the striker has completely misfired for Chelsea during his brief spell at the club, notching up only ten goals and 11 assists in 41 appearances.
Wener's shooting has been dismal, to say the least. He has averaged a lowly 1.1 shots on target per 90 minutes out of 2.7 shots per game - with 20 shots off target and 17 blocked out of 62 attempts.
These are still early days for Werner at Chelsea, and things could improve for the better, but he hasn't provided a good first impression.
#2 Fernando Torres
One of the best forwards in the modern game - Fernando Torres - made a rather surprising move. Ending a four-year stint at Liverpool, Torres arrived at Chelsea for £52.65m in 2011 - making him the Blues' most expensive acquisition till Morata's arrival.
Fernando Torres was one of the most feared strikers in world football, scoring 81 goals and providing 20 assists in 142 appearances for Liverpool.
Torres made his Chelsea debut against his former teammates, but providing glimpses of his immense talent, he never managed to replicate the form he showed at Anfield. In 172 appearances for the west Londoners, Torres managed a rather underwhelming return of 45 goals and 35 assists.
However, Torres made a good habit of consistently lifting silverware during his four-year spell at Chelsea. He played a crucial role in Chelsea's Champions League triumph, scoring a memorable solo goal against Barcelona in the semi-final. The Spaniard also lifted a Europe League trophy with the Blues.
#1 Andriy Shevchenko
Former Ballon d'Or winner and Ukraine's all-time record goal-scorer Andriy Shevchenko was a huge flop at Chelsea. The striker came to English shores amid huge expectations from the Blues faithful and was a statement signing of sorts that Chelsea could attract the biggest names in the game.
Shevchenko was a Roman Abramovich favourite and arrived at Chelsea in 2006 with a burgeoning reputation. The striker had a fabulous seven-season stint at AC Milan, making 220 goal contributions (175 goals and 45 assists) in 322 appearances.
However, Shevchenko struggled with the rigours of Premier League football. The Ukrainian legend found the back of the net just 22 times in 77 appearances for Chelsea before he was transferred back to AC Milan after a two-year spell in London.