West Ham 1-0 Chelsea: 3 lessons learned by Conte after latest defeat
In the weekend's first Premier League fixture, defending Premier League champions Chelsea fell to a shock 1-0 defeat by David Moyes' West Ham side at the London Stadium.
Marko Arnautovic's curled finish beyond Thibaut Courtois after just six minutes was enough for the Hammers, who defended well as a collective unit and were made to work hard too.
Antonio Conte will undoubtedly be frustrated with his side's inability to penetrate their opponents in the final third with much regularity. As a result, they remain 11 points behind leaders Manchester City - who can extend the gap further with a game in hand against arch-rivals United.
The defeat will give Conte some food for thought going into a testing run of fixtures. Here are three key lessons to be learned from this loss.
#1 The Blues cannot rely too much on Hazard and Morata
Eden Hazard and Álvaro Morata have been Chelsea's star players so far this season, but is there too much reliance on the pair?
As seen against the Hammers, when the duo are having an off day, there are not many players who can step up and win them points.
Morata had a couple of opportunities to score but it just wasn't his day. The worrying thing is a lack of a goalscorer that Conte trusts to come on from the substitutes' bench.
Michy Batshuayi, a natural forward, was an unused substitute on this occasion but both Willian and Pedro were introduced - to no effect.