What a save from Jordan Pickford. Ollie Watkins heads a powerful header into the ground, it bounces up and Pickford just claws it onto the post.

Image source, Getty Images

Brennan Johnson is clean through on the break but he tries to cut inside on his left. He fires over the bar in the end but at one point there looked liked so much space for him. A rare Forest attack and one he will be frustrated by.

Image source, PA Media

Southampton's Stuart Armstrong is booked for fouling Wilfried Gnonto.

And then Leeds bring on Crysencio Summerville for the Italy forward.

Image source, Getty Images

Phil Dawkes
BBC Sport at Elland Road

The Leeds fans are swinging their scarves and singing 'Champions of Europe' in an attempt to try and spark something... anything from their side.

This is balanced on a knife edge. All it needs is one moment of quality. Or equally, one big error.

A nice ball through by Ben White. Bukayo Saka tries to cut it back but Victor Kristiansen comes across to concede the corner.

How isn't this a goal to Everton?!

Alex Iwobi takes a shot from the edge of the box. It's going wide but Ezri Konsa is down injured and it hits the Villa defender and comes back into the six-yard box.

Neal Maupay bundles the ball over Emiliano Martinez, who also stays down, and Tyrone Mings clears the ball off the line.

The goalline technology is used to show Mings got it away literally on the line.

Arsenal have scored again but it's been ruled out again. Martin Odegaard chips it over to Gabriel Martinelli, who is inches offside. He tees up Bukayo Saka to poke it over the line but the flag is up straight away. A close call but it looks like the right one.

Everton's Leon Bailey looks incredulous as he's penalised for barging over Idrissa Gueye. Not a whole load else happening at GP.

Carl: You can feel the panic in VAR trying to quickly find a reason to rule Martinelli’s goal out…

Said Benrahma's cross was going to come through to Danny Ings, who was completely unmarked and would surely have scored but Renan Lodi gets a crucial block in.

Seconds later, Jarrod Bowen smashes it against the post, then Lucas Pacqueta dinks it inches wide!

It's a painful one for Gabriel Martinelli as the replay shows Wilfred Ndidi caught him on his leg afterwards.

He's up and running again now and he's put Arsenal ahead within 51 seconds of the restart.

Image source, Reuters

A decent chance for Forest. Nayef Aguerd has to hastily clear a very dangerous ball in from Neco Williams.

West Ham go up the other end a few minutes later, win a corner, but the cross in is too high for Tomas Soucek.

Danny Gabbidon
Former Wales defender on BBC Radio 5 Live

It doesn't look good for Martinelli, he's just off balance and plants his knee down and twists it.

He was played in brilliantly by Trossard and it's a great finish.

Villa's Jacob Ramsey drags a cross-shot wide of the far stick. Seamus Coleman, challenging him, is hurt but recovers quickly enough.

Nedum Onuoha
Former Manchester City defender on Football Focus

If an attacker doesn't celebrate, they must be injured. Looks like he's been stood on.

What a way to start the second half for Arsenal; very much puts Leicester on the back foot.

Southampton defender Armel Bella-Kotchap, who was done by Patrick Bamford there, is down and needs treatment. It's not the first injury problem the German has had today. He's back on though.

This time Patrick Bamford stays on his feet but his shot is straight at Gavin Bazunu.