Marcos Alonso enters the game and replaces A. Christensen.
Barcelona make another change to try and slow the game down. Two former Chelsea players are switched with Christensen coming off for Alonso.
Carlos Fernández enters the game and replaces A. Sørloth.
Sorloth is replaced by Fernandez. The former Crystal Palace striker had a huge chance to score the equaliser earlier in the game but missed the target from close range.
Busquets curls an inviting head over the head of Sorloth towards Fati who rushes onto it. Matching his run, a Barrenetxea heads it behind.
Ansu Fati enters the game and replaces O. Dembélé.
With a goal to his name, Dembele is now off the pitch. Fati is on and will play on the left wing with Raphinha on the right.
Inside the box, Lewandowski heads the ball down to De Jong who chips it across to Raphinha. Free on the right, the substitute completely misses the ball attempting a volley.
Barcelona are in control, but having scored just once, Sociedad are still in the game.
Dembele's inswinging cross from the right goes straight into the gloves of Remiro.
Raphinha enters the game and replaces Alejandro Balde.
Robert Navarro enters the game and replaces T. Kubo.
Jon Ander Olasagasti enters the game and replaces Pablo Marín.
A second change for Barcelona. Balde is given a rest with Raphinha coming on. Araujo is now at left-back with Busquets moving to centre-back.
Kubo has been Sociedad's best player, but is now coming off. Navarro will look to make the difference in the final 12 minutes.
Sociedad are now making two substitutions. Olasagasti replaces Marin.
F. Kessié enters the game and replaces Pedri.
Xavi makes his first change of the game. Kessie comes on in the midfield to replace Pedri.
Dembele has been electic. This time cutting inside from the right, he dribbles past Normand before shooting low. Dipping in front of the goalkeeper, Remiro does well to collect the ball.
On the left, Balde sets the ball back to Lewandowski who drifts wide. The striker moves it onto his right foot before curing a cross towards De Jong, but it is cleared away before it gets to the Dutchman.
Christensen chips the ball from left to right looking for Pedri in the box. Trying to head it across to De Jong, Normand gets a head on it first, hitting the ball against the midfielder before hacking it clear.
On the counter, Sorloth moves through the middle third of the pitch before looking for Barrenetxea with a throughball. However, Araujo and Kounde get across to block his path and come away with the ball.
Martín Zubimendi gets yellow.
Zubimendi is protesting his innocence but receives a yellow card. Gavi gets past the midfielder, with the Sociedad man pulling his shirt to stop him from progressing.
Gavi rushes into the box, playing a quick one-two with De Jong to get away from his maker. Looking to shoot, the midfielder is bundled to the floor by Barrenetxea. He wants a penalty, but the referee allows the game to continue.
Pedri gets yellow.
Pedri is now in the book after pulling Kubo's shirt with the Sociedad man breaking forward with pace.
On the edge of the box, Kubo curls his free-kick against the wall.
Sergio Busquets gets yellow.
Busquets receives Barcelona's first yellow card of the game after committing a tactical foul on Barrenetxea.
O. Dembélé has scored a goal for Barcelona! Assist by J. Koundé.
GOAALLLL! DEMBELE SCORES! 1-0 BARCELONA! The home side have a deserved lead. On the right, Kounde curls a low pass down the flank to the midfielder. Rushing forward into the box, he powers an effort towards the near post with the goalkeeper diving the other way. He gets a touch on the shot but cannot push it away.
Moments after missing a golden opportunity, Kounde gets an assist to his name. He looks up and picks out the run of Dembele who is onside. Taking a good first touch, he drives inside before fooling the goalkeeper with a low shot towards the near post.
Gavi is rolling around on the floor with players surrounding the referee. Elustondo pushed the midfielder after a coming together.
Aihen Muñoz enters the game and replaces Diego Rico.
Barrenetxea enters the game and replaces Mikel Oyarzabal.
The second Sociedad substitution comes in the attack. Quiet in the first half, Oyarzabal is replaced by Barrenetxea.
Sociedad have made a couple of changes at half-time. Firstly, left-back Rico is replaced by Munoz.
The game is back under way for the second half. Who will progress to the semi-finals of the Copa del Rey?
HALF-TIME: BARCELONA 0-0 REAL SOCIEDAD
Sociedad are trying to hold on until half-time. They have nine players behind the ball with Sorloth isolated in the attack.
There will be three minutes of additional time.
WIDE! Kounde bends the ball wide of the post. He receives a pass from Dembele, shifting it past a Sociedad defender. With options in the middle, the defender goes alone, slipping and curling his strike wide.
De Jong plays the ball inside to Lewandowski who flicks it to Pedri. Running beyond the Sociedad defence and into the box, his low shot is saved. The flag goes up for offside, but it was tight.
Brais Méndez goes off after a red card!
RED CARD! After checking the monitor, Mendez is sent off after a high tackle on Busquets. He stood on the ankle of the Barcelona man after going late into a challenge.
Mendez goes to ground. He thinks that Lewandowski should be punished after his hand hit his face but the referee allows the game to continue.
With nobody pressing him, Pedri unleashes a shot from outside the box. Bouncing just in front of him, Remiro collects his effort.
On the edge of the box, Dembele looks to play a throughball to Lewandowski who runs behind the Sociedad defence. Stretching for it, Rico gets a touch on his pass and sends it back to the goalkeeper.
Marin jumps into Busquets and gives away a free-kick just outside the box. Looking for Araujo, Pedri's cross goes over the head of the defender and is cleared away by Marin who will be thankful that nothing came of the chance.
WIDE! Dembele has been involved in every Barcelona attack so far. In space on the right, he decides against going past the defender, instead picking out the run of De Jong who rushes towards the near post. With nobody going with him, he pokes his effort just wide.
Pedri keeps the ball close to his feet just outside the box, beating a couple of defenders before possession is poked away from him. It goes in the direction of De Jong whose backheel goes into the hands of the goalkeeper.
Going near the corner flag, Gavi is put under pressure by two Sociedad defenders. Flicking it back to Dembele, the winger looks inside to Balde who finds De Jong. Playing a one-two with the defender, the former Ajax man chips it over the defence to his team-mate, but his cross from the left is cleared away.
CHANCE! Barcelona move forward with pace down the right wing after Ter Stegen finds Dembélé with a direct pass. On the right side of the box, the Frenchman holds onto the ball waiting for options. Cutting it onto his left foot, he finds Lewandowski who has his shot blocked.
Barcelona have controlled the opening exchanges of the game. However, they have not broken through the Sociedad defence that is standing firm.
Another corner from Pedri fails to find a Barcelona team-mate. This time Remiro punches it away from danger. He could have caught it but chose the safest option.
Barcelona have the first shot of the game. On the left flank, Pedi and Balde play a one-two. The midfielder feeds the ball inside to Busquets who dribbles past one defender before playing it back to the wing. Balde receives it, cutting inside before curling a shot well over the bar.
Pedri's outswinging corner goes over the head of Araujo and is cleared away by Oyarzabal who is back to help the defensive effort.
Sociedad get this Copa del Rey quarter-final under way at Camp Nou.
Hello and welcome to the live commentary for the Copa del Rey quarter-final clash between Barcelona and Real Sociedad.
As for Sociedad, they have played two more games than Barcelona to get to this stage of the Copa del Ray. Imanol Alguacil’s team brushed aside Cazalegas and Coria before back-to-back 1-0 wins over Logrones and Mallorca. Champions in 2020, Sociedad exited the competition at this point last season, losing 4-0 to eventual winners Real Betis. Just six points behind Barcelona in LaLiga, the away side come into the game in good form and will be hoping to secure their eighth straight win in all competitions.
Barcelona thrashed Ceuta in the previous round to progress to the quarter-final stage of the Copa del Ray after avoiding an upset in the last 32. Travelling to Intercity, the third-tier side levelled the score on three occasions through hat-trick hero Oriol Soldevila before Ansu Fati scored the decisive goal in extra time. Barcelona have won the competition 31 times – more than any other side – and have lifted the trophy five times in the past eight seasons.
BARCELONA (4-3-3): Marc-Andre ter Stegen; Jules Kounde, Ronald Araujo, Andreas Christensen, Alejandro Balde; Frenkie de Jong, Sergio Busquets, Pedri; Ousmane Dembele, Robert Lewandowski, Gavi.
REAL SOCIEDAD SUBS: Andoni Zubiaurre, Asier Illarramendi, Ander Barrenetxea, Carlos Fernandez, Aihen Munoz, Robert Navarro, Benat Turrientes, Ander Martin, Urko Gonzalez de Zarate, Jon Ander Olasagasti.
Barcelona have been excellent so far. Nullifying the Sociedad attack, they have dominated and will be disappointed that they have not scored with an xG of 1.61. Dembele has been their best player, picking the ball up from deep positions and running at the opposition's defence. As for Sociedad, their best hope may be putting everyone behind the ball. They struggled to break forward with 11 men on the pitch, with the red card making it much more difficult to get in advanced positions. For their lack of potency going forward, they have stopped Barcelona from creating high-quality chances, with most of their shots coming from outside the box.
REAL SOCIEDAD (4-1-4-1): Alex Remiro; Aritz Elustondo, Igor Zubeldia, Robin Le Normand, Diego Rico; Martin Zubimendi; Takefusa Kubo, Brais Mendez, Pablo Marin, Mikel Oyarzabal; Alexander Sorloth.
That's all for today, goodbye.
Next up, Barcelona travel to Girona in LaLiga with Sociedad going to Real Madrid.