Watch the only goal so farpublished at 38 mins
Southampton 1-0 Shrewsbury
This is the goal which is the difference so far, with Dan N'Lundulu getting it on his first Saints start.
Southampton through to FA Cup fourth round
N'Lundulu and Ward-Prowse with Saints goals
Shrewsbury manager Cotterill in hospital with Covid-19
League One club not played since December
Michael Emons
Southampton 1-0 Shrewsbury
This is the goal which is the difference so far, with Dan N'Lundulu getting it on his first Saints start.
Southampton 1-0 Shrewsbury
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.
Southampton 1-0 Shrewsbury
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.
Southampton 1-0 Shrewsbury
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.
Southampton 1-0 Shrewsbury
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.
Southampton 1-0 Shrewsbury
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.
Southampton 1-0 Shrewsbury
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.
Southampton 1-0 Shrewsbury
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.
Dan N'Lundulu
It has taken the Premier League side 16 minutes to go ahead.
A long ball forward is brought down by Southampton's Caleb Watts, Shrewsbury do a poor job of clearing the ball and it falls to Dan N'Lundulu and he strikes low and hard from a tight angle, it goes through the legs of Scott Golbourne and into the bottom corner.
But wait, VAR check.
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.
Southampton 0-0 Shrewsbury
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.
Southampton 0-0 Shrewsbury
Ali Bruce Ball and Glenn Murray are on commentary duty so press the play button at the top to listen along.
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Southampton 0-0 Shrewsbury
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.
Southampton 0-0 Shrewsbury
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.
Southampton 0-0 Shrewsbury
Pre-match huddles done, knees taken, whistle blown, here we go.
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?
Southampton v Shrewsbury Town (20:00 GMT)
For the first time in 2021, Shrewsbury are ready to play a match. The long wait is nearly over.
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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.
Southampton v Shrewsbury Town
The winners of this one get to play Arsenal at home on Saturday.
This is the draw for the fourth round.
Southampton v Shrewsbury Town (20:00 GMT)
And you can listen live to BBC Radio 5 Live commentary by pressing the play button at the top.
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