As both Jurgen Klopp and Claude Puel have said, it's only half-time in this League Cup tie and the second leg at Anfield should be a cracker. 

That's it from us for tonight. See you later!

Liverpool

Liverpool manager Jurgen Klopp on 5 live: "I am not happy of course. The game changed when they scored a goal and we lost a lot of what we needed.

"Our passing game got nervous, I don't know why. We gave the ball away so easily and we needed Loris Karius to save our lives two or three times.

"The best thing for us is the result. We know that we can play better at Anfield, nothing is decided.

"We cannot be happy with the performance, Southampton cannot be happy with the result. It could and should have been 2-0, 3-0.

"I can't remember a clear chance for us."

Southampton boss Claude Puel, speaking to Sky Sports: "We are deserving this result with all the many chances we had. It was important to win with the clean sheet and we can have a strong game at Liverpool. I think Liverpool had just the one chance all game. We were unlucky at the end because we know Liverpool away in the second leg will be very difficult. 

"It was the same in the Premier League - a strong defence - but this game was interesting because we were strong in defence and were better to keep the ball and to have a very good counter attack. It was a very, very good game but it is just the first leg and we are just one goal up. 

"This competition is exciting, now it is important to keep the good concentration for the Premier League. We lost three games so it is important to have the good reaction."

Image source, Getty Images

Tense. Nervy. Edgy... Relief. Joy. Barcelona and their fans have taken a ride on the whole emotional rollercoaster that football has to offer. But it is worth it - the holders are through to the Copa del Rey quarter-finals. 

Hugs all around for Lionel Messi after his brilliant free-kick proves the difference between Barca and visitors Athletic Bilbao after 180 minutes of push and shove. 

Image source, Getty Images

Chief football writer Phil McNulty described Liverpool as shocking tonight, put your questions to Phil live on Facebook now.

Chris Hickman: Only 11 days ago we beat City and everything was peachy, a bit of perspective needed.

Albert Poon: Thank goodness it's only half-time in this tie. Liverpool need to break this winless streak asap.  

Peter Campbell: Liverpool lost the 1st leg of their Europa League semi final 1-0, and won the 2nd leg comfortably. Wait until Anfield!

Liverpool boss Jurgen Klopp, speaking to Sky Sports: "After the goal we conceded the reaction was not good. We lost timing, we were not compact enough, everything changed and that reaction was not good. Maybe it is easy to explain - we made wrong decisions - but it is a cup game and especially in an away cup game you concede a goal and it is tough.

"They had the biggest chances because we were not compact enough in situations and Loris Karius had to save our life, a deserved win for Southampton but it is only half time.

"In this moment I am not too happy with the performance after 1-0. We should have been more clear in our passing. It is difficult, we could have done better. Things like this happen. 

"We were in a good shape when we started, but the reaction was not good. Why exactly I will have to look again. The second leg will be a completely different game. Nobody should think it is already decided."

Image source, PA

Cometh the hour, cometh the Messi! A roar of relief as Lionel Messi does the business when it really matters. As usual. The Barcelona forward whips in a delicious free-kick to give the home side breathing space. But... one more Athletic goal will see them through to the Copa del Rey last eight. Into the final 10...

Image source, AP

Alan Shearer
Ex-England captain

Liverpool will fancy their chances of turning things around in the return leg, but they've got to score and that something's they've struggled to do of late - they've scored just twice in the three games in 2017 and have failed to score in successive matches for the first time in almost a year.

Southampton

Southampton captain Virgil van Dijk: "We won and kept a clean sheet which was important. We played good football at times against a great team but we were unlucky today. It's all about communication at the back, we talked to each other well. It will be tough, we knew that, but it's a good win. We need to believe - a final is something special for the club."

Southampton goalscorer Nathan Redmond: "I should have had four goals today. I didn't realise how much time I had but I will learn from those mistakes. At least we won and we can take a lead to Anfield."

Image source, Getty Images

Steve Claridge
Ex-Leicester striker on BBC Radio 5 Live

Liverpool lacked a wide player, the two full-backs took an eternity to get forwards. Southampton were always set and when crosses did come in Virgil van Dijk was dominant in the air. 

While Spanish champions Barcelona struggle to break down their stubborn Copa del Rey opponents, there have also been a few problems for their Italian counterparts. 

Juventus, aiming for a third successive Serie A and Coppa Italia double, survive a stirring fightback from Atalanta to win 3-2 in their last-16 tie. Meanwhile, French double winners Paris St Germain are 2-0 ahead against Metz in their Coupe de la Ligue quarter-final. Thiago Silva has bagged both goals. You've read that right. 

Image source, AP

Shane Daly: Sturridge showed tonight that I would rather have his uncle Dean playing up front.

Stevey Gee Sings: In the grand scheme of things I will take that. Let's take The Saints down at Anfield.

Ashton Moore: I like him as a footballer, but on the evidence of the last two games, Emre Can't.

Image source, Reuters

Steve Claridge
Ex-Leicester striker on BBC Radio 5 Live

You can make a strong case for Southampton winning 2-0 or even 3-0. Everyone here is happy but this is an opportunity missed.

If Southampton don't go through they will be kicking themselves. This is an opportunity missed. 

Image source, Reuters

BBC Radio 5 live

Image source, Rex Features

When you're playing football at 9.30 but have to revise for a big test at 11...  

Phil McNulty
BBC Sport chief football writer at St Mary's

Southampton deserved to win by more. Liverpool absolutely shocking - can count themselves lucky.

All over and Southampton win the first leg 1-0, but they could have had a couple more. 

Sets things up nicely for the second leg, though. That takes place at Anfield on 25 January.

Image source, Reuters

Steve Claridge
Ex-Leicester striker on BBC Radio 5 Live

Liverpool would still be favourites - I may have swayed the other way if Southampton had a second. As they should have done.

Another bit of skill by Philippe Coutinho 25 yards from goal opens up a bit of space for the Brazilian to have a pop of goal, but he skies his effort. Jurgen Klopp sucks his teeth before breaking out a wry smile at the awfulness of the shot.

Image source, Reuters