This is the goal which is the difference so far, with Dan N'Lundulu getting it on his first Saints start.

A lucky let-off for the Saints as the Shrews' Harry Chapman is free on the right wing and his cross takes a massive deflection off of defender Jack Stephens.

The ball loops up and could go anywhere, with Fraser Forster frantically back-peddling and luckily for the Saints the ball drops just wide for a corner, which comes to nothing.

Forster makes a fine save to deny Shaun Whalley, who is getting the best Shrewsbury chances. The flag's up so it wouldn't have counted, but Forster didn't though that and did well to palm it away.

Glenn Murray
Brighton striker on BBC Radio 5 live

Apart from not dealing with a long ball and conceding from that, which I'm sure Shrewsbury will be really disappointed with, I think they have done really well, they've had three or four shots at Fraser Forster.

A chance for a second Southampton goal and it falls to Caleb Watts but he can't get it on target, it's a bad connection and balloons over the bar.

At the other end, Shaun Whalley, on the left corner of the penalty area, cuts on to his right foot and looks to curl it into the top corner, but gets too much on it and it's over.

That's a goal for Dan N'Lundulu on his first start for the Saints. He's a 21-year-old forward, who was born in France but has represented England at Under-16 level.

A day in his career he will never forget.

James Ward-Prowse with a free-kick from just outside the penalty area. We all know how dangerous he can be from this position and he whips it over the wall, but also just over the bar.

The referee thought there might be a handball when Caleb Watts brought the ball down, but it's not given and the Saints lead. N'Lundulu's goal stand. Saints lead.

Image source, Getty Images

In these conditions you want to get any shot on target to test the keeper. That's what the Shrews' Harry Chapman does as he tries his luck from 30 yards and the ball zips up off the greasy surface, but Fraser Forster watches it all the way and isn't deceived by the ball bouncing up just in front of him.

It's still raining heavily and it's windy too. Tough, tough conditions.

The Saints have been the better side so far though, dominating possession with the League One side yet to test Fraser Forster.

Ali Bruce Ball and Glenn Murray are on commentary duty so press the play button at the top to listen along.

Glenn Murray
Watford striker on BBC Radio 5 Live

This is a huge evening and opportunity for these Southampton players, these young lads to stake a claim for a place in the Premier League.

The hosts get the first effort of the game as Jake Vokins has a strike at goal but it's tipped over the top by Shrews keeper Matija Sarkic, on loan from Wolves.

Pre-match huddles done, knees taken, whistle blown, here we go.

Image source, Getty Images

It's a filthy day on the south coast as the players come out of the tunnel to face the torrential rain.

Can Shrewsbury cause a shock against a largely youthful Saints side?

For the first time in 2021, Shrewsbury are ready to play a match. The long wait is nearly over.

And we already know the draw for the fifth round with Chorley of National League North or Premier League Wolves waiting in the future if one of the sides today can see off Arsenal at the weekend.

• Fulham/Burnley v Bournemouth/Crawley Town
• Manchester United/Liverpool v West Ham or Doncaster
• Sheffield United/Plymouth v Millwall/Bristol City
• Chorley/Wolves v Southampton/Shrewsbury or Arsenal
• Barnsley/Norwich v Chelsea/Luton Town
• Everton/Sheffield Wednesday v Wycombe/Tottenham
• Swansea City/Nottingham Forest v Cheltenham Town/Manchester City
• Brentford/Leicester v Brighton/Blackpool

The winners of this one get to play Arsenal at home on Saturday.

This is the draw for the fourth round.

• Cheltenham Town v Manchester City
• Bournemouth v Crawley Town
• Swansea City v Nottingham Forest
• Manchester United v Liverpool
• Southampton/Shrewsbury v Arsenal
• Barnsley v Norwich
• Chorley v Wolves
• Millwall v Bristol City
• Brighton v Blackpool
• Wycombe v Tottenham
• Fulham v Burnley
• Sheffield United v Plymouth
• Chelsea v Luton
• West Ham v Doncaster
• Brentford v Leicester
• Everton v Sheffield Wednesday

And you can listen live to BBC Radio 5 Live commentary by pressing the play button at the top.