It initially looked bad, but Aleix Vidal is made of strong stuff. He gets up, shakes it off and is good to go.

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It is worth remembering just how formidable Barcelona have been so far in 2016. They've played 10 games and won all of them, and the side they have out tonight is still not a bad one. A win would be a good result for Gary Neville.

On the pitch, some concern for Barcelona as Aleix Vidal goes down clutching his knee after a heavy tackle.

Good start to the second half as Valencia attack straight away, with Santi Mina heading just wide from a cross.

Gary Neville barely had time to sit down before he is up and applauding the effort.

Forty five minutes. Six goals needed. It would be the comeback of all comebacks if Valencia can do it.

The hosts get the second half under way.   

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Bayern Munich have just doubled their lead against Bochum, Thiago Alcantara with the goal.

In the other game we are keeping an eye on, it is goalless between PSG and Lyon.

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"Well if Alvaro Negredo can score, maybe the comeback is..."

"No, Phil."

A ripple of applause throughout the Mestalla Stadium. The few thousand fans seem content with what they have seen so far from their side. Long way to go though. 

Another Barcelona free-kick around 25 yards from goal. Ivan Rakitic wisely opts not to shoot or cross, rolling the ball to Adriano, who whips the ball towards the far post but Munir flicks a header just wide.

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No celebrations from Gary Neville after Alvaro Negredo's goal. Suppose you would look a bit daft given his side need six more goals to level this tie.

Still, a shoot of promise.

Valencia defender Ibrahim Diallo, who is 19, is making his first appearance for Valencia and he shows a bit of naivety as he bundles over Sergi Roberto, earning himself a yellow card.

It's a good position for a free-kick, dead centre and a shade over 25 yards from goal and Ivan Rakitic is the man once again to take the set piece. 

It's a terrible effort, though, get someone else on free-kicks.

At the other end, Barcelona have a free-kick on the left side of the box. Ivan Rakitic takes it, aiming for the far post but gets his radar all wrong and the ball flies over.

A bit more encouragement for Gary Neville as Fran Villalba, the man labelled the new David Silva, fizzes an effort just over the bar from outside the area.

Some angry shouting from Luis Enrique in the Barcelona dugout. Valencia have come into this a bit more now.

The results have been poor, but Gary Neville has not been helped by some awful performances from his players.

Alvaro Negredo's finishing especially would make Christian Benteke's latest efforts look world class.

Twenty five minutes gone here and no shots on target. Think we can safely say a Valencia comeback isn't going to happen...

Better from Valencia! 

They break forward at pace through Danilo, who works a ball wide to Alvaro Negredo and the former Manchester City man tries to pick out Santi Mina with a low cross, but Marc-Andre ter Stergen is quick to collect the ball.

Lovely work from Munir. Well, until the finish. 

The Barcelona forward evades the legs of three players, knocks the ball forward and skips past another challenge but lashes wildly at his shot and it is well wide.