Chelsea 1-3 Southampton: 5 things we learned as Blues' disastrous start continues at Stamford Bridge

 Helpless and hopeless Jose Mourinho was booed by his own fans as Southampton deepened the crisis at Chelsea. The Special One is officially under pressure as Ronald Koeman’s side condemned the Champions to their fifth defeat in all competitions and their fourth in eight Premier League games.

Worse still, Mourinho humiliated midfielder Nemamja Matic after calling him from the bench to replace Ramires at half time - only to take him off after just 26 minutes.

The home fans booed the decision along with the move to replace goalscorer Willian as Falcao laboured.

Southampton may have scored three but they could have had several more as Chelsea's leaky defence failed utterly to cope with the visitors' strike force. Willian netted in the tenth minute direct from a free-kick which flew into the top corner.

Steven Davis volleyed an equaliser from the edge of the box after the ball was chested into his path by Graziano Pelle two minutes before the break.

Man of the Match Sadio Mane took advantage of a mistake by John Terry, restored to the starting line-up by Mourinho, to put the Saints ahead on the hour. And Mane set up Pelle to rifle home a third with 18 minutes left.

Southampton were also denied two first-half penalties, first when under-fire Branislav Ivanovic pulled on the shirt of Virgil van Dijk in the box then when Ramires tripped Mane in the box.

Here are five things we learned.

1) Terry might be staring down the barrel of another spell on the bench

The Champions have now kept just two clean sheets in their last 11 games in all competitions.

Terry was making his first start in the Premier League since the 3-1 defeat at Everton yet he was at fault for Mane’s goal.

By then Steven Davis had already scored, Ramires should have given away a penalty and Branislav Ivanovic was also lucky not to do so too.

2) Ivanovic is still a liability

Mourinho continues to keep faith with the Serbian but his opponents continue to cash in.

Southampton should have conceded a penalty when Ivanovic pulled on the shirt of Virgil van Dijk in the box.

Tadic became the latest player to bamboozle him with a deft move to ghost past him shortly after half time.

It remains a mystery as to why Mourinho does not drop him, move Azpilicueta to right-back and slot £21.7m Baba Rahman in on the left.

3) Mane enhances his glowing reputation

Southampton were annoyed at the way that Manchester United leaked their supposed interest during the summer to deflect from their failed attempt to land Pedro.

That said, the 23-year-old Senegal midfielder is surely a player they could yet revisit.

He has now netted five time 12 appearances this season and is easily Southampton’s key man.

4) Chelsea crowd beginning to turn

They booed the decision to take off goalscorer Willian for substitute Pedro. Some fans made it cleared that they’d have preferred Cesc Fabregas to come off instead.

Then widespread boos and incredulity swept around Stamford Bridge as Nemanja Matic, thrown on at half time, was replaced by Loic Remy after 28 minutes.

Late on a section of the fans in the Matthew Harding Stand chanted: ‘We’re f*****g s***’.

The team as a whole do not look to be improving one iota and Southampton bossed them for long periods of this game.

5) Falcao really has lost it

It is sad to see. A player that was once the most feared frontman in Europe did not even belong in this company.

Mourinho talked in pre-season about the Colombian proving a few people wrong this season after Manchester United decided against making his disastrous loan permanent.

Falcao, however, has become even worse. How he lasted 90 minutes is a mystery.

Diego Costa can’t come back soon enough.