The shot attempt count is 13-1 in favour of Liverpool (seven different Reds players had at least one shot in the first half).

But Villarreal have now not conceded a first-half goal in any of their six Champions League away matches this season.

A Champions League semi-final match has not ended goalless since Man City v Real Madrid at Etihad Stadium in the first leg in 2015-16.

Karen Carney
Former Chelsea midfielder on BBC Radio 5 Live

Villarreal haven't got in a battle - they've just kept their shape, and sat really deep at times - they have come here to frustrate and they want to stay in this tie and they're quite happy to take it back home and stay in there and just try and nick a 1-0 at home.

They did that against Bayern Munich and that's their objective, it's no different here.

Chalk and cheese, this and last night.

After just one added minute, the half-time whistle blows.

Liverpool have dominated, but Villarreal will be the happier side.

They've set out their stall to defend and it has frustrated the Reds.

Geronimo Rulli is forced out of his goal to dive at Mohamed Salah's feet and save. The flag is up, though. Salah went a bit too early to try and get on Fabinho's neat pass.

What a hit!

Thiago belts an effort from range that beats the diving Geronimo Rulli but smashes against the frame of the goal.

It may well need a strike like that to finally break this stubborn Villarreal resistance.

Liverpool fans again scream for a foul, but it is, in fact, a superb sliding challenge from Juan Foyth to stop Luis Diaz getting in.

So much frustration around the ground now.

Villarreal are playing a canny game, breaking play up at every opportunity, winning easy free-kicks from naive Reds play.

Rulli doesn't do catching does he?

He comes out and is well-placed to grab a chipped ball into the box from Ibrahima Konate but opts instead for a punch that keeps the pressure on.

Phil McNulty
BBC Sport chief football writer at Anfield

Villarreal coach Unai Emery will be satisfied as we get to within ten minutes of half-time. Liverpool are creating half chances but Villarreal are composed and slowing the game down to suit their own purposes when they can. Liverpool, however, doing all the pressing.

Liverpool almost caught cold!

Giovani lo Celso is found behind the Reds defence by a long ball forward, but his volley on the stretch goes over.

It is exactly little moments like this that Villarreal are looking for. Soak up everything they can and hope to make their few chances at the other end count.

Chance!

Trent Alexander-Arnold is playing as an out-and-out winger now. her is found out right for a volleyed cross that Mohamed Salah meets with his own volley in the box. He gets it wrong, though, and sends the ball over the bar.

Karen Carney
Former Chelsea midfielder on BBC Radio 5 Live

The best coaches and managers foresee things happening - Liverpool have played this heavy metal football for a long time where it's just energy, hunting, pressing and flair but sometimes you don't have the players to be able to do that and that's why they brought Thiago in.

They need those type of players who can find space in pockets for these type of tight games.

Just wide!

Luis Diaz sets up Sadio Mane on the edge of the box and after his first touch sends the ball bouncing up, he hooks an effort that deflects wide.

It is one-way traffic. Villarreal are just hammering the ball back to Liverpool and resetting.

Image source, Getty Images

Virgil van Dijk is the first man into the book.

He stands his ground and is clatters into Samuel Chukwueze (or more likely it is the other way around). The ref gets out his yellow card.

It's attack v defence.

Luis Diaz re-enacts his effort from earlier, cutting inside before lashing a shot that Geronimo Rulli punches away.

Pau Torres is now down having blocked the free-kick with his head. It prompts more groans from a home crowd who feel this is just timewasting and a way to break up the Reds' momentum.

Trent Alexander-Arnold does hit it but the wall does its job, leaping to block.

If Villarreal can keep Liverpool out playing like this for 90 minutes it would be some rear-guard action.

Trent Alexander-Arnold is fouled on the edge of the box. This is a great chance to test the visiting keeper.

Trent fancies it...

Liverpool keep coming.

Mohamed Salah chips a ball into the box for Sadio Mane and then charges in for a return pass. Salah goes for the far post but curls his shot over.