That is that from me.
But you can follow all the Premier League reaction here.
St Mary's is stunned but another brilliant comeback from Leicester.
Former Spurs striker on Final Score
"Mahrez comes on, changes the game and Vardy starts firing!"
He doesn't miss twice. Brilliant from Jamie Vardy as he blasts home into the back of the net after being sent clear.
Five minutes of added-on time signalled.
Southampton are hanging on for their dear lives...
Close for Leciester as Jamie Vardy heads downwards and at Kelvin Davis after good wing play from Nathan Dyer.
As Leicester push for an equaliser, Southampton look increasingly dangerous on the break.
The game is halted as Saints skipper Jose Fonte goes down injured.
Sadio Mane is sent clear on goal for the hosts but, out of legs, he opts for a 45-yard lob. No chance, the ball sails over.
That was Jamie Vardy's moment.
Danny Drinkwater combines with Riyad Mahrez down the right and the latter pulls the ball back to an unmarked Vardy just 10 yards out.
The Premier League's top scorer has his head in his hands though as he strikes over. What. A. Chance.
A rare bit of respite for Southampton as Jay Rodriguez sends a bouncing shot straight at goalkeeper Kasper Schmeichel from 20 yards. The Foxes are well in this though...
Jay Rodriguez replaces Dusan Tadic in attack for Southampton.
Former Spurs striker on Final Score
"What a great header! Vardy is a livewire, he doesn't know when to stop running and he chases lost causes."
Former Aston Villa striker on Final Score
"That is some header. Leicester seem to be so dangerous in the second half of games. Nathan Dyer turned Virgil van Dijk inside out on the wing, and Jamie Vardy reached the cross at its highest point - he really powered home."
All the outfield 10 of Southampton's starting XI were involved in international matches over the past fortnight and it is telling, they look tired.
Leicester are pushing...
Nathan Dyer won the FA Youth Cup with Southampton but the Leicester loanee is proving a real danger to them.
His run and cross from the right put it on a plate for Jamie Vardy...
Leicester have already won six points from losing positions this season.
Are they about to go again?
Game on and who else but Jamie Vardy?
The Premier League's top scorer nets for a sixth successive league match, heading in from Nathan Dyer's cross from the right.
Great wing play by Dyer.
A blast towards goal from Graziano Pelle after a neat back heel from Sadio Mane but it is high, wide and not very handsome.
Double change for Southampton as midfielder Jordie Clasie makes his Premier League debut after an £8m move from Feyenoord.
He replaces Steven Davis, while Maya Yoshida replaces Cedric Soares.
Riyad Mahrez has sparked some more attacking intent into Leicester since coming in off the bench at half-time.
The next goal will prove crucial here...
What a chance to put the game out of sight for Sadio Mane. The Saints striker races through on goal, beats goalkeeper Kasper Schmeichel - who had raced out of goal - but, with the goal gaping, Danny Simpson recovers and clears.
You have to do better Sadio.
Jamie Vardy shows nice feet to beat Victor Wanyama before striking at Kelvin Davis from 20 yards. A frustrating afternoon for the England man so far.
Riyad Mahrez will actually play just behind Jamie Vardy, with former Saints player Nathan Dyer on the flank.
Mahrez has been in stunning form this season. Can he spark something?
Double change for Leicester as Riyad Mahrez replaces Shinji Okazaki and Nathan Dyer is on for Jeff Schlupp. The pair are likely to form a three-pronged attacked alongside Jamie Vardy.
We are under way...
Good point Paul...
For any Southampton fan thinking this is 'game over', remember Leicester were 2-0 down against Aston Villa before winning 3-2.
Don't count your chickens and all that....
Dusan Tadic is proving Southampton's main attacking threat as shown by his (white 11) average position in the graphic below.
Leicester have a mountain to climb...
Sublime stuff from Dusan Tadic as he cuts in from the left but his side-footed shot is fairly comfortable for goalkeeper Kasper Schmeichel.
So close for Lecester as Danny Drinkwater's driving shot is tipped over by Kelvin Davis.
Virgil Van Dijk's Johnny on the Spot moment...
Leicester in real trouble now as Virgil Van Dijk prods home at the second attempt after Graziano Pelle's glanced header came off the post.
Cedric Soares is a brave lad. He is back on with an massive bandage. Saints now on top and they almost double the lead as Sadio Mane's curling effort is clawed away by Kasper Schmeichel.
There is no way Cedric Soares can continue, is there? The claret is still flowing from his head and he still looks a little woozy. He is back on his feet though and continues to receive treatment on the sidelines.
Cedric Soares and Jeff Schlupp clash heads as they challenge for the ball and are both down.
Blood appears to be coming from both. They know where they are but that looks painful.
Easy stuff for Jose Fonte's opener but Leicester's defence were nowhere...