M. Taremi has scored a goal for Porto! Assist by Nanu.
Nanu is given a lot of space on the right and he whips a great cross into the far post to set up Taremi's goal.
WHAT A GOAL! It's absolutely incredible from Taremi as Nanu swings a cross into the substitute at the far post. He goes for the spectacular with the overhead kick and the Chelsea defenders and Mendy can only watch as it loops into the far top corner and Porto have a late goal back. 1-0 Porto!
90' +2
O. Giroud enters the game and replaces K. Havertz.
Another change for Chelsea now as Tuchel brings on Giroud for Havertz.
90'
It's sloppy from Porto whenever they get out of their own half and they're giving the ball away cheaply in their attempts to get forward. Diaz's throughball into Taremi is cut out by Pulisic and he wins a free-kick when he's pulled back by Vieira.
88'
L. Díaz gets yellow.
Pulisic is breaking away for Chelsea again and Diaz drags him down to stop the attack and he's shown a yellow card.
86'
H. Ziyech enters the game and replaces M. Mount.
Chelsea are making their first change now and it's Mount that's going off for Ziyech.
84'
Fábio Vieira enters the game and replaces Sérgio Oliveira.
Final change for Porto now, and it's Oliveira that's making way for Vieira.
82'
Pepe gets yellow.
It's a late challenge from Pepe on Pulisic which earns him a yellow card.
79'
Oliveira swings another corner into the box, but it's a Chelsea player on the end of it again. Rudiger heads it down and it takes a deflection off Uribe at the near post before bouncing into Mendy's gloves.
77'
Chelsea win a free-kick just inside their own half and Kante takes it quickly, playing a long ball forward for Havertz to chase. He pulls away from Mbemba but is then nudged away from it by Pepe so Marchesin can collect it.
Minute
Description
75'
L. Díaz enters the game and replaces J. Corona.
Evanilson enters the game and replaces M. Marega.
Nanu enters the game and replaces Wilson Manafá.
And Corona is also going off, with Diaz on for him.
Marega is also taken off, with Evanilson on to replace him.
There's a triple change for Porto now and Manafa is the first to make way, with Nanu on in his place.
74'
J. Corona gets yellow.
Corona is booked after he tugs back Jorginho's shirt to stop Chelsea's attack.
72'
Otavio wins a free-kick in midfield and Oliveira swings the cross into the area. It's cleared by Jorginho, but Porto manage to keep it alive with Manafa drilling a cross into the six-yard box, but it's cleared by Azpilicueta.
70'
It's a sloppy pass out from the back by Pepe and he gives it straight to Kante. He slots it through to Pulisic first time and he steps away from Sanusi to get into space for a shot, but Pepe recovers well to block it at the near post.
67'
Porto are keeping the ball well at the moment, but all of their possession is in front of Chelsea near the halfway line. They're trying to push forward down the right, but a sloppy pass from Manafa gifts it back to Chilwell.
63'
M. Taremi enters the game and replaces M. Grujić.
Porto are making the first change of the game and it's an attacking one as Taremi comes on to replace Grujic.
62'
Porto go for a more direct approach with Sanusi driving at James and playing a one-two with Uribe to help get him away from the defender. He has Marega to aim for in the middle, but the cross is poor and Mendy collects it for Chelsea.
60'
Porto look like they're completely out of ideas on how to get themselves back into this game and are very slow on the ball when they do win it back from Chelsea. Sanusi spots Manafa in space on the opposite flank but overhits the pass straight out for a throw-in.
58'
Conceicao isn't happy with something on the touchline which catches the referee's attention and he's shown a yellow card for dissent.
56'
It's better from Chelsea now as they're keeping Porto penned back in their own half. James plays a one-two with Pulisic to open up some space down the right, but his cross lets him down as he plays it straight to Pepe.
52'
Otavio swings a corner into the box for Porto and he's looking for Pepe at the near post, but Jorginho is there to head it clear. Oliveira has another chance to whip it into the middle, but yet again, it's Chelsea that reach it first, with James hooking it away.
50'
Marega touches the ball back to Otavio, who's in a lot of space on the right, and he whips a great cross into the far post. Sanusi and Oliveira are both going for it, but James does really well to get up and nod it behind for a corner.
48'
Corona turns away from Chilwell on the right and spots Marega peeling away from Rudiger in the box. He tries to drills a throughball into him to get him in on goal, but he hits it straight at the defender, who clears his lines.
46'
Sérgio Oliveira gets yellow.
Porto get us back underway for the second half!
Pulisic drives forward and Oliveira steps across him and sweeps the American's feet out from under him to earn the first yellow card of the game.
45' +1
HALF-TIME: CHELSEA 0-0 PORTO.
45'
Chilwell is the Chelsea player furthest up the pitch at the moment, but he isn't being allowed any time on the ball by Porto's defence. He's trying to hold it up and wait for Havertz to join him, but he's nudged off it by Manafa, who breaks on the counter.
43'
Mount is allowed a lot of space as he cuts inside from the left and carries it to the edge of the box, waiting for support to join him. James gets forward on the right, but Pepe stops him from picking out the right-back.
41'
Porto are starting to up the pressure on Chelsea again here, this time looking to make something happen through Otavio down the left. He plays a good one-two with Oliveira to get into space, but the final ball into the box lets them down again, and Azpilicueta clears it.
39'
It's a sloppy pass by Rudiger as he gifts it to Grujic and he drives forward towards the box. He touches it out to Corona on the right and he pulls it back for the return pass, but Jorginho is back to clear the danger for Chelsea.
37'
Oliveira isn't closed down by Chelsea and he has time to pick out a pass into Uribe to his left. He's a long way from goal but decides to have a shot anyway and Silva gets in the way of it to make the block.
35'
Kante is there to cut up another of Porto's attacks in midfield and he turns to thread it through to Pulisic. He touches it past Mbemba but then fouls the defender in his attempt to break forward.
31'
Kante finds himself in a pocket of space in the middle and he gets his head up to spot Chilwell making a driving run into space down the left. He tries to switch it out to him, but there's too much on the pass and there's nothing the left-back can do to keep it in.
29'
Jorginho plays himself into trouble when he's trying to find a pass out and he doesn't see Otavio closing him down until the last second. It's nicked off him by the Brazilian, but luckily for him, Rudiger is there to stop the attack.
27'
Chelsea break on the counter-attack again and Kante has options on either side of him. He knocks it onto Havertz to his right and he takes a touch before drilling it at the near post, but Pepe is there to block it ahead of Marchesin.
25'
Porto are still dominating the ball, but their passing in the final third is still letting them down at the moment. Grujic turns away from Kante in the middle and is looking for Corona with a throughball, but it's easily intercepted by Azpilicueta.
23'
Chelsea are still struggling to get out of their own half due to Porto's high press and James is forced to switch play out to the left to get out of trouble. Chilwell nods it on towards Havertz, but he just can't reach it ahead of Grujic.
21'
Most of Porto's attacks are going down the right side at the moment and Otavio plays a one-two with Oliveira to open up some space for him. He tries to take it around Jorginho, but the midfielder holds his ground to win it back.
19'
Chelsea break quickly on the counter and with Kante leading through the middle and he does brilliantly when he's forced wide by Manafa. He holds onto the ball under pressure and drills a low cross into the middle, but James drills it wide of the far post.
17'
Corona does really well to squeeze a pass into Otavio when he's closed down by Chilwell and Jorginho and Porto have three in the box for him to aim for. Otavio overhits the cross though and Uribe can't keep it in on the far side.
15'
Chelsea are just starting to find their rhythm now and are patiently moving upfield with Chilwell down the left. Porto are quick to drop back into their shape though and making it difficult for them to get into the final third.
10'
Porto are still pushing high upfield with Oliveira cutting inside to try and play a throughball into Marega in the middle. It's well cut out by Silva though and he sends it into Pulisic to set Chelsea on the counter.
8'
It's Chelsea's first real attack and Mount makes a good run through the middle and sets himself for a shot when space opens up ahead of him. He drills a low shot on goal but Mbemba is there to make a block and send it wide of the near post.
6'
Porto are still keeping possession well here and Chelsea just can't get out of their own half at the moment. Manafa finds space to run into down the right and he floats a cross into the middle of the box, but it's just too high for Marega.
4'
Jorginho turns away from Grujic in midfield and tries to chip a pass over the top to Havertz. He brings it down with his first touch, but can't control it and Sanusi does really well to hold him off and play himself out of trouble.
2'
Porto have made a very bright start to the game and are putting Chelsea under some early pressure here. Mbemba switches play out to Corona on the right and he tries to backheel it into Marega in the middle, but Silva intercepts it.
1'
Havertz gets the game underway for Chelsea!
Hello and welcome to live coverage of the Champions League quarter-final second leg between Chelsea and Porto at the Ramon Sanchez-Pizjuan!
It was Chelsea that came out on top last week in Seville with a comfortable 2-0 win in the first leg thanks to goals from Mason Mount and Ben Chilwell. Thomas Tuchel's side then followed it up with a 4-1 victory over Crystal Palace in the Premier League at the weekend. Porto know they need to score at least twice to stand a chance of getting through and come into this game on the back of a win after beating Tondela 2-0 in the league on Saturday.
CHELSEA STARTING XI (3-4-2-1): Edouard Mendy; Cesar Azpilicueta, Thiago Silva, Antonio Rudiger; Reece James, N'Golo Kante, Jorginho, Ben Chilwell; Mason Mount, Christian Pulisic; Kai Havertz.
CHELSEA SUBS: Callum Hudson-Odoi, Andreas Christensen, Marcos Alonso, Tammy Abraham, Kurt Zouma, Timo Werner, Kepa Arrizabalaga, Emerson, Olivier Giroud, Willy Caballero, Hakim Ziyech.
PORTO STARTING XI (4-3-3): Agustin Marchesin; Wilson Manafa, Chancel Mbemba, Pepe, Zaidu Sanusi; Marko Grujic, Mateus Uribe, Sergio Oliveira; Corona, Moussa Marega, Otavio.
PORTO SUBS: Fabio Vieira, Mamadou Loum, Luis Diaz, Romario Baro, Diogo Leite, Nanu, Mehdi Taremi, Claudio Ramos, Malang Sarr, Evanilson, Toni Martinez, Francisco Conceicao.
The teams are out on the pitch now, with kick-off just moments away.
This game will suit Chelsea so far, despite having few chances to get forward, they haven't been caused any real trouble by Porto. The visitors' passing in the final third has let them down so far and Conceicao might need to make a change if they want to get the two goals they need to stand a chance of making the semi-final.
That's all for today, goodbye!
Chelsea will have to wait until tomorrow to find out if they'll face Real Madrid or Liverpool in the semi-final in two weeks' time. Their attention now turns to another semi-final though as they face Manchester City in the FA Cup on Saturday. Porto's attention now turns to the league with their next game against Nacional at the weekend.
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