Manchester City make four changes from the side that drew 1-1 against Leeds. In come Nathan Ake, Sergio Aguero, Bernardo Silva and Joao Cancelo.

Midfielder Kevin De Bruyne picked up an injury during the international break, while Ferran Torres drops to the bench. There is no place in the squad for defender Aymeric Laporte or Benjamin Mendy.

Aguero makes his first appearance for the club since June.

Arsenal make three changes from the side that defeated Sheffield United. Defender David Luiz and midfielder Mohamed Elneny drop to the bench, as does forward Eddie Nketiah.

Granit Xhaka, Nicolas Pepe and Rob Holding return to the XI.

Manchester City striker Sergio Aguero is in the starting XI, making his first appearance for the club since June having recovered from a knee injury.

Arsenal's new £45m deadline day signing Thomas Partey starts from the bench.

The first change brings a debut for Hakim Ziyech. Lot of high hopes for this kid.

Mason Mount is the man withdrawn.

Add another player to the list of goal-scoring Germans for Chelsea in the Premier League.

Kai Havertz becomes the sixth different German player to score, quickly following Timo Werner.

As mentioned earlier in the live, the list also includes Ballack, Marin, Schurrle and Rudiger.

No side in the Premier League has more in the competition (Arsenal and Man City also six).

Feel free to have a go at naming the six players from City and Arsenal.

A nice little period of play brings Southampton a corner - their first of the match. Zouma twice does well to get the ball away before Romeu hammers a shot from range high and wide.

Rob Green
Former West Ham and England goalkeeper on BBC Radio 5 Live

The way this game is going, who knows where it is going to go.

It's been a crazy 20 minutes or so.

That goal from Danny Ings set this game alight. .

There were just 121 seconds between Che Adams' equaliser for Southampton and Kai Havertz putting Chelsea 3-2 up.

Jermaine Beckford
Ex-Leeds Utd striker on Final Score

This kind of thing happens as soon as you score a goal. Everyone is out of position, you are not quite where you should be. That was what happened in a nutshell.

Rob Green
Former West Ham and England goalkeeper on BBC Radio 5 Live

Mount, Werner and Havertz have barely had a kick between them this half and then they create that.

It's a simple goal from Havertz.

It's such a shame no one is here in the stadium to see this.

It's the perfect response from Chelsea, but the worst possible thing to happen for Southampton after a positive start to the second half was rewarded with the equaliser.

Key now for the visitors is to try and build up that head of steam again.

Saints are having a good little spell, pushing Chelsea back and asking a few questions.

Kyle Walker-Peters' low drive from an angle is saved by Kepa.

Oh, that's close. Southampton work space on the edge of the box, despite the presence of a lot of Chelsea bodies, and Ings fires low and just past the post.

There are two alternative story-lines running in parallel in the second half at Stamford Bridge.

Chelsea are unbeaten in their last 81 Premier League games at home in which they've been leading at half time (W67 D14), since a 3-5 defeat to Arsenal in October 2011.

But in Danny Ings, Southampton have a striker who travels well.

Only Jamie Vardy (28) has scored more Premier League goals since the start of last season than Ings (26), with more than half of his goals coming away from home (14).

Rob Green
Former West Ham and England goalkeeper on BBC Radio 5 Live

This is better from Southampton - they are a lot more balanced, their pressing is not just focused on one side.

It's the whole of the pitch and Chelsea can't find a way through.

Southampton are working hard here to disrupt Chelsea's rhythm, refusing to allow them to get into their stride as they did near the start of the first half.

Ben Chilwell looks to get away into the Saints half, but across James Ward-Prowse to tackle.

Alex Scott
Former England and Arsenal defender on Final Score

Southampton are back in the game now they have got that goal. It's up to Chelsea to stay concentrated and push on from what they were doing in the first half. Creatively, in the final third, that was the best I have seen from Chelsea this season so far. If they stay concentrated and carry on in that vein, they will be OK.