Goalkeepers are the focal point this weekend and Thibaut Courtois is the latest to make an error of judgement, he's well out of position and trips Gylfi Sigurdsson. Penalty!

I'd love to have Diego Costa in my team but he is the ultimate irritant to the opposition. Again he clashes with Jordi Amat - who is actually doing a good job on him. Just don't get sent-off!

That may be easier said than done as Amat now ploughs through the back of Branislav Ivanovic. Use your loaf Jordi! You can't win the ball there. 

Chelsea Warrior: Clear as daylight #Swansea, external out to irritate Costa into a red card. Mitchy time, Conte

Peter Kobia: Costa is an absolute disgrace in football.

Diego Costa and/or Jordi Amat are surely going to be sent off soon! They are head to head now in the penalty area after a coming together. Costa was eased off the ball at the near post after good play from Eden Hazard.

Swansea counter and Kyle Naughton lashes over the top after good work from Modou Barrow. 

Image source, Reuters

John Hartson
Ex-Wales striker on BBC Radio 5 live

Thirty seconds ago Diego Costa is rolling around the ground holding his head and then 30 seconds later gets the ball and is sprinting upfield. Unbelievable.

Image source, Reuters

Diego Costa is back with us. Is he the most booed player in the Premier League?

Swansea now have an attack and Gylfi Sigurdsson has a shot blocked, Chelsea counter and Costa is tripped by Jordi Amat again.

Antonio Conte is livid! Costa can amp up the atmosphere of any party in town...

John Hartson
Ex-Wales striker on BBC Radio 5 live

Jordi Amat has sort of headbutted Diego Costa from behind there. He can't really complain about the booking, although the home crowd aren't happy.

You can never really tell with Costa. Is he hurt or not?

Image source, Reuters

Diego Costa is down for a long time, a good few minutes. He looks shaken up. 

Image source, PA

Panto villain Diego Costa draws boos and jeers from the stands as he goes down after a clash of heads with Jordi Amat. Amat is booked, the home fans are not happy. 

Costa needs some treatment. 

Image source, Reuters

When Chelsea were struggling in the first half of last season it was hard to really put a finger on what it was they had lost.

Well, the desire, determination, effort, whatever you want to call it, is back. Within a minute of the restart a slack Jack Cork pass is picked off by Nemanja Matic, Willian is in to make a tackle too and Diego Costa has a shot blocked.

Willian then is allowed to cut in a shoot right across goal - but Eden Hazard can't reach it. 

Chelsea get us back up and running. A second goal is very much needed for Antonio Conte's men.

Image source, AFP

As it stands Chelsea will go level on points with leaders Manchester City at the top of the Premier League - both teams on 12 points from four games - but will be second on goal difference.

Swansea will be 16th. 

BBC Sport looks back at West Ham's 4-2 collapse at home against Watford, as manager Slaven Bilic struggles to defend his side's performance and pundits are aghast at the Hammers' latest defensive showing.

For fans of analysing 'styles of play', Chelsea played just five passes more than Swansea in that half (249-244) but had 14 shots on goal to Swansea's two.  

It was a typo I've narrowly avoided all game, so I'm pretty glad that John Hartson was instead the first to call Swansea left-back Stephen Kingsley Ben.

Which Oscar winning actor could Swansea do with in the second half?

Image source, Getty Images

John Hartson
Ex-Wales striker on BBC Radio 5 live

Swansea are very lucky going in at 1-0. Chelsea should be home and dry by now.

The reason Neil Taylor is fuming is because he is Swansea's number one left-back. Swans manager Francesco Guidolin has decided to take Taylor off and keep young Stephen Kingsley on.