We are into the first of a minimum of two added minutes.
Parejo is shown a yellow card for a cynical trip on Suarez right in front of the referee. He can have no complaints.
89'
Barca are just knocking around short passes know, playing it back to Cillessen as Valencia implement a half-hearted high press. They're just winding down the final seconds.
86'
Messi looks to feed the arching run of Suarez with a ball in behind the defence, but the Uruguayan is flagged for offside to bring the move to an end. Valencia appear to have given up here, though you can't really blame them.
84'
Pique was struggling with a knee injury in the build-up to this match and he was just filmed paying close attention to his right leg on the dugout, seemingly experiencing a bit of pain. With a Champions League last-16 tie against Chelsea on the horizon, Barca will hope it's not too serious.
83'
Y. Mina enters the game and replaces Piqué.
Colombia international Mina is on for his Barcelona debut as a late replacement for Pique.
82'
I. Rakitić has scored a goal for Barcelona! Assist by L. Suárez.
GOOOOOOAAALLL!! RAKITIC GETS BARCA'S SECOND!
GOOOOOOAAALLL!! RAKITIC GETS BARCA'S SECOND! A slack pass from Gabriel is pounced upon by Suarez and he gets to the top of the box before squaring for Rakitic, who guides a fine finish past Domenech.
Suarez just doesn't give up! His pressure punished Gabriel and led to his second assist of the match.
81'
Kondogbia fouls Rakitic in a central area 25 yards out from goal and Messi has a chance to get on the scoreboard from the ensuing free-kick. However, he spoons it over the top and gets nowhere near the target.
79'
Time is running out for Valencia and it seems unlikely they're going to make a fist of this. Barca have just proved too strong for them in every area.
77'
OPTA STAT: Suarez helped get Coutinho off the mark for Barcelona and also assisted his first goal for Liverpool back in February 2013.
Minute
Description
75'
S. Zaza gets yellow.
Zaza is penalised for a foul on Umtiti and remonstrates with the referee, earning himself an overdue booking.
74'
THAT. IS. INCREDIBLE! Gaya is unmarked inside the six-yard box from Soler's header and smashes a volley on target but Cillessen somehow, miraculously, gets an arm in the way and turns it away for a corner! It's unlikely you'll see many better saves this season.
73'
Valencia have struggled to threaten Barca since falling behind, with Vietto in particular a peripheral figure in this half. They need a goal soon to have any chance of keeping their dream of making the final alive.
71'
Rúben Vezo enters the game and replaces E. Garay.
Vezo comes on in place of Garay.
70'
Garay's match looks over. He's carried off on a stretcher with his head in his hands. It looks like a hamstring injury sustained while chasing back on the previous play.
69'
WHAT A CHALLENGE! Gabriel looks sure to lose out in a two-on-one against Suarez and Messi, but he manages to get across and block the latter with a tremendous sliding tackle - though the chasing Gaya's presence no doubt helped.
68'
The whistles ring around Mestalla once again as Alba stays down following a challenge from Montoya, who took the ball despite getting plenty of the player too!
66'
JUST OVER! Zaza runs the ball away from goal on the left side of the box but manages to dig out a cross to Guedes, who powers a header narrowly high of the target! Cillessen had launched himself towards it, so he thought it was going close.
65'
Paulinho enters the game and replaces Andrés Iniesta.
Iniesta's time is up and he makes way for Paulinho.
62'
WHAT A CHANCE! Suarez tees up Messi by the penalty spot and his side-footed shot takes a deflection off Garay's hand before being batted away by Domenech! Alba rushes in with the follow-up which appears to strike the arm of Montoya on its way behind, though again nothing is given by the referee!
61'
CLOSE! A corner from the right richochets in the box before falling to Soler 20 yards out. He attempts to guide the ball into the bottom-left corner but is unable to hit the target.
59'
How has Zaza still not got a yellow card? He snaps at the ankles of Coutinho, but seems to get off without punishment as the Brazilian stays on his feet. However, the referee eventually pulled play back.
57'
Barca already appear content to allow Valencia to hold possession. They will likely just look to do further damage on the counter-attack as the hosts push to get back into the tie.
55'
Carlos Soler enters the game and replaces Rodrigo.
Gonçalo Guedes enters the game and replaces F. Coquelin.
Rodrigo has been impressive tonight but he appears to be hobbling as he makes way for Soler.
Another change from Marcelino sees Guedes replace Coquelin.
53'
Valencia just can't get the ball away from Messi and Suarez, with the latter attempting to bend a shot inside the far post with his right foot. He gets it wrong, and Parejo is perhaps lucky to get away with a push on Messi inside the box in the build-up.
51'
That's an away goal for Barca too, meaning Valencia now need three if they are to avoid elimination. Let's hope they go for it in the remaining 40 minutes and provide us with an entertaining half!
49'
Philippe Coutinho has scored a goal for Barcelona! Assist by L. Suárez.
That was excellent from Suarez, getting to the byline and finding the stretching Coutinho on the opposite side of the box.
GOOOOOOOAAAAAL!!! COUTINHO HAS HIS FIRST BARCELONA GOAL! The Brazilian is on target for the first time since his club-record arrival from Liverpool, turning home at the back post after Suarez turned Garay inside out and produced a brilliant cross.
48'
Rodrigo gets the crowd fired up by drilling a shot at goal from 25 yards, which takes a deflection and goes out for a corner. The delivery is flicked on before being dealt with Pique, but it's a positive start to the second period for Valencia.
46'
Philippe Coutinho enters the game and replaces André Gomes.
Gomes has been replaced by Coutinho.
We are back under way, and there's been a change for Barca.
45' +1
And there's the half-time whistle!
45'
Kondogbia is picked out on the left side of the area by a brilliant pass from Coquelin and he manages to create room for a shot, only to slam it into the side-netting.
44'
There's a chance to break the deadlock for Suarez but he's surrounded by bodies on the left side of the area and stabs a fairly tame shot straight at Domenech.
42'
Zaza's hopes of initiating a break are stopped by the referee, who deems he shoved Umtiti over in front of the dugout and conceded a free-kick. He's adamant he won the ball, but the official isn't interested.
40'
We're closing in on half-time and, despite plenty of action on the pitch, goal-mouth action has largely been at a minimum. It seems unlikely we'll see a breakthrough before the interval.
38'
Messi is so tightly marked by Parejo that the Valencia midfielder ends up pulling the Argentine's shirt over his head! Nothing is given by the referee, and moments later Pique is sent crashing to ground after Rodrigo's challenge for an aerial ball.
37'
Alba lifts the ball into the box and Messi backs up towards goal in hope of bringing it down. However, Domenech rushes out and clambers over the Barca superstar to punch it away.
36'
Suarez is the latest player to go down under a robust Valencia challenge, with Garay this time the culprit. His tackle came after Messi jumped over a sliding Parejo near the half-way line, and Barca are asking for more cards to be shown.
35'
Messi sends his free-kick straight into the wall! You'd expect better from the virtuoso forward, but he was unable to test Domenech there. Things are getting pretty fiery now.
34'
Rodrigo gets yellow.
There's the first yellow card! Rodrigo hacks down Messi in a central area 25 yards out, offering Barca a decent chance to open the scoring...
32'
Rodrigo looks to slide Zaza in but Pique slides across to send the ball out for a corner. He can only head the resultant set-piece half clear and Montoya darts into the box before failing to test Cillessen, with a rebound off Vietto leading to a goal-kick.
30'
You never want to have Messi running at you and he takes advantage of Gaya standing off him to cut onto his left foot and try to bend the ball into the top-left corner. He gets plenty of whip on it but cannot swing it back inside the post - no doubt to Domenech's relief.
29'
Suarez shows great chest control to bring a ball over the top down in behind the defence, but he is adjudged offside. That was a very, very close call.
27'
GOOD SAVE! Zaza loops the ball over Pique and looks sure to go through on goal, but he tries to feed Vietto instead. His pass is poor and the Argentine has to lay it back to Rodrigo, whose venomous effort is pushed aside by the diving Cillessen.
25'
Valencia have got control of possession and have slowed the pace, rather than continually using up their energy on counter-attacks. They eventually probe down the right through Rodrigo and then Coquelin but can't create an opening.
23'
It's also worth noting that the away goals rule is in use.
22'
Valencia are having to withstand heavy pressure at home - according to Opta, Barca have had over 68 per cent of possession here! However, it's Marcelino's side who have gone closest with Rodrigo sending a header against the crossbar. While it remains 0-0, they'll be confident of nicking something.
20'
Gomes wastes a great chance to create another opening for Barca as he completely miscues a cross from the right, which ends up flying out for a throw-in on the opposite side of the ground. Ernesto Valverde spins around and pulls his coat up over his mouth!
19'
More whistles for Barca as they casually play the ball across the face of the Valencia defence. The hosts eventually pick them off and launch a break, but Zaza's cross from the right is cut out by Rakitic.
16'
Iniesta displays his incredible vision by sliding a pinpoint pass through the heart of the Valencia defence, offering Suarez a one-on-one chance with Domenech. However, the Uruguayan cannot get his feet right and his first touch allows Garay to make an important recovery challenge.
14'
OFF THE BAR! Rodrigo rises to meet a left-wing cross from Gaya, getting ahead of Pique to crane a header across Cillessen's goal. It has the beating of the keeper but crashes off the woodwork and is cleared.
12'
Barca work the ball over to the right for Gomes and he flights it into the centre for Suarez. Gabriel tries to get a leg to it and ends up thighing it back towards his own goal. Fortunately for him, Domenech is well positioned and adjusts to keep it out.
10'
Another clumsy foul from Zaza, this time on Sergi Roberto, results in the Italian receiving a final warning from the referee. The Valencia fans whistle at the right-back, clearly feeling he is feigning injury. He was only under pressure due to Montoya's interception of a pass by Messi launching a counter-attack.
9'
Gabriel is beaten by the agility of Messi and cuts him down just over 20 yards out with his right leg. The forward bends the resulting free-kick towards the top-right corner but Domenech springs across and punches the ball to safety. He made that save look better than it really needed to be!
7'
Barca look to launch a counter-attack through Messi, who offloads to Suarez on his right. The Argentine is unable to get back into space to retrieve possession so Suarez goes it alone, producing a heavy touch as he tries to round a defender. Gomes is able to get on the end of it but he commits a foul in trying to keep the move alive.
6'
The first shot at goal comes courtesy of Coquelin! The midfielder plays a one-two with Zaza and drills the return pass low and down the centre of Cillessen's goal, enabling him to make a routine save.
5'
It's all Barcelona at the moment and there's a nervy moment for Parejo as a wayward pass almost hands possession to Suarez on the edge of the Valencia box. He just about gets away with it, though!
3'
Kondogbia goes down after being caught by Gomes, with the referee eventually pulling play back after trying to play advantage. Messi kicks the ball away and is given a talking to by the official.
2'
Zaza chopped down Alba within 20 seconds of kick-off and Barca's opening spell of possession is being heavily whistled by the home fans. Valencia are yet to get a hold of the ball, though, with the visitors proving patient with the ball at feet.
1'
We are under way at Mestalla!
Valencia subs: Neto, Ruben Vezo, Nemanja Maksimovic, Toni Lato, Carlos Soler, Santi Mina, Goncalo Guedes.
Hello and welcome to tonight's live commentary on the Copa del Rey semi-final second leg between Valencia and Barcelona at Mestalla.
Defending champions Barca hold a 1-0 advantage from the first leg at Camp Nou courtesy of Luis Suarez's second-half goal. Just 90 minutes separates them from a date with Sevilla in the final!
The line-ups have been announced, so let's see how the teams will be shaping up.
Valencia (4-3-3): Jaume Domenech; Martin Montoya, Gabriel, Ezequiel Garay, Jose Gaya; Dani Parejo, Geoffrey Kondogbia, Francis Coquelin; Luciano Vietto, Simone Zaza, Rodrigo Moreno.
Barcelona (4-4-2): Jasper Cillessen; Sergi Roberto, Gerard Pique, Samuel Umtiti, Jordi Alba; Andre Gomes, Ivan Rakitic, Sergio Busquets, Andres Iniesta; Lionel Messi, Luis Suarez.
Barcelona subs: Marc-Andre ter Stegen, Nelson Semedo, Aleix Vidal, Yerry Mina, Paulinho, Philippe Coutinho, Paco Alcacer.
After a bright start to the season, Valencia have hit a bad run of form and have lost all of their last five games - although a penalty shoot-out triumph over Deportivo Alaves during that run sent them into the Copa semis. A spot in the final could provide the perfect boost for Marcelino's men.
Since being beaten by Real Madrid in the Supercopa de Espana, Barca have lost just one of their subsequent 35 matches in all competitions. However, that defeat came away to Espanyol in the previous round of the Copa, offering Valencia a crumb of hope.
The teams are out on the pitch and kick-off will be upon us in just a few moments.
HALF-TIME - Valencia 0-0 Barca (0-1 agg): The Catalans are 45 minutes away from the Copa del Rey final! However, it's been a tense affair at Mestalla, with Rodrigo's header that crashed back off the bar proving the closest either side has come to breaking the deadlock. Messi has looked typically brilliant in possession, but Domenech has not been truly stretched by Valverde's men yet. Stay tuned for the second half!
That's all from me. Have a great night!
FULL-TIME - Valencia 0-2 Barcelona (0-3 agg): The Catalan giants are into the Copa del Rey final against Sevilla! The defending champions got the better of a spirited Valencia side thanks to second-half strikes from Coutinho and Rakitic. The hosts have lost a sixth straight match but can take heart from a courageous performance against LaLiga's top side, who remain on course for another treble triumph.
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