#1 Alvaro Morata

After the Diego Costa saga, Conte desperately needed a striker and bought Alvaro Morata from Real for a whopping £70 million. He got off to a promising start, scoring 6 times in the league. Morata, however, pulled his hamstring and Conte was told to prepare for life without the Spaniard for a few weeks.
Here is why Morata's absence will hurt Chelsea
In a season where they have fewer shots on goal than Newcastle and Stoke City, Morata is the one involved in creating 75% of the clear-cut chances. He started the Chelsea comeback after the demoralising Burney defeat on opening day and was the architect behind the comeback win against Atletico Madrid.
He is the target man that Conte system relies on at the moment. With Chelsea playing 7 games in next 23 days, Morata's absence will put a dent in their title race.