Full-time: Chelsea 1-3 Southampton
- Chelsea deservedly suffer their fourth defeat of the season at Stamford Bridge
- Another free-kick from Willian had given the hosts the lead, before Steven Davis levelled before half-time
- Southampton produced a strong second-half display and secured their first away win in 11 matches courtesy of goals from Sadio Mane and Graziano Pelle
- Jose Mourinho: "This is a crucial moment in the history of this club ... because if they sack me they will sack the best manager they ever had"
So, a fourth defeat of the season for a woefully underpar Chelsea side who have now conceded 17 goals in the top-flight already. The word 'crisis' is bandied about far too regularly in the world of modern sport, but it is clear that the champions are in a desperate spot just at the moment and their hopes of retaining the title are surely now completely gone with that 10-point gap to leaders Manchester City.
As you would expect, the majority of the reaction from this result will focus on Mourinho's woes. However, what must not be lost during the widespread inquests is the confident nature of Southampton's impressive display. This was certainly no smash and grab, Koeman's side created more chances and took them with ruthless precision after the break.
That is all from us for now, but stayed tuned for coverage of England's pivotal Rugby World Cup Pool A encounter against Australia at Twickenham. Our football coverage returns tomorrow, with the small matter of a Merseyside derby between Everton and Liverpool as well as Arsenal v Manchester United from the Emirates Stadium and Tottenham's trip to Swansea. Goodnight.
Chelsea 1-3 Southampton
Koeman attempting to eat up the clock and preserve the lead as he brings off Mane, who has been a constant menace to Chelsea today, and throws on centre-back Maya Yoshida.
Southampton are unsurprisingly getting men behind the ball as Pedro is crowded out in the penalty area by a swarm of red and white striped shirts. Five minutes of added time to play.
Wasteful from Oscar as he tries to sweep a pass out to Fabregas on the right flank but overhits it and watches as the ball sails harmlessly out of play.
Chelsea dominating possession now but they only have two minutes plus stoppage time to erase the deficit. Saints holding firm.
A clear foul from Pelle on Hazard gives Chelsea a free-kick in an excellent position just right of centre. The striker is booked before Falcao's driven effort is deflected over by the head of Bertrand.
Something of a let-off for Stekelenburg as he fails to hold Remy's cross but Pedro can only shoot wide.
A second substitution from Southampton as Koeman sends on Jay Rodriguez in place of Tadic.
So close to 4-1 as Terry makes an impressive block to deny Tadic after the Southampton midfielder opted to take a touch inside and shoot himself instead of playing in Davis in space to the right.
Ward-Prowse has been cautioned for a shirt pull on Oscar.
Mourinho responds to that goal by hauling off Matic - who himself had only replaced Ramires in the second half - in favour of Remy. Chelsea are in a shambles.
Things go from bad to downright awful for Mourinho as Southampton establish a two-goal lead. Hazard gives the ball away cheaply a few yards into the opposition half and Mane leads a swift breakout.
With Tadic also running to his left, the former Red Bull Salzburg winger elects to play in Pelle to the right and he makes no mistake with a cool finish. This is no less than the Saints deserve, you have to say.
Goal: Chelsea 1-3 Southampton (Graziano Pelle)
A painful one there for Falcao as he cops the force of Mane's studs. 20 minutes remaining at Stamford Bridge.
Tadic flights a good free-kick just wide of Begovic's left-hand post. Terry then has to be alert to repel more danger before Ward-Prowse sends a speculative effort into the gods. It would have to have been quite some strike to go in from there.
Chelsea fans seemingly unhappy with that change as boos can be heard around the stadium. Falcao is very fortunate not to receive a second yellow card for a poorly-timed slide on Mane.
We neglected to mention earlier that Matic had been brought on for Ramires. A second Mourinho change sees Pedro replace Willian.
Woeful from Chelsea as Cahill is caught in possession by Tadic. He then links up well with Pelle before sending a low pass to Mane, who expertly rolls Terry before nutmegging Begovic. The ball deflects off the goalkeeper but still ends up in the back of the net.
Are Chelsea heading for a fourth Premier League defeat of the season?
Goal: Chelsea 1-2 Southampton (Saido Mane)
Another controversial moment and another booking for diving as Falcao knocks the ball around Stekelenburg before going to ground in theatrical fashion. Replays show he was already heading down before the contact when ironically he would almost certainly have been fouled had he remained on his feet for a split-second longer.
Pressure from Chelsea as a corner from Fabregas is cleared. Oscar then sends the ball back into the box towards Falcao, but the former Manchester United loanee is unable to make contact with the header thanks to some strong defending from Bertrand.
Chelsea are cut to ribbons as Mane misses two good chances to give the visitors a second-half lead. Twice teed up by Tadic, the second time after he had left Ivanovic in a twisted heap, he is initially denied by Begovic before having another effort blocked. Ward-Prowse then fires wide.
One change at half-time for Southampton as Ward-Prowse replaces Romeu.