21:45. Sadly, that's all we've got time for tonight. I hope that you've enjoyed following our LIVE coverage of Basel - Porto. I've been Oliver Emmerson, and hope to see you next time on VAVEL UK.
21:43. After claiming that vital away goal, you would most likely expect Porto to be the victors when these sides meet again in the second leg. A mention must go to referee Mark Clattenburg who had an exceptional game throughout.
21:41. Well, that's that. Despite a resolute defensive display from Basel, Porto eventually got the goal they most probably deserved through that Danilo penalty, which levelled things up after Derlis Gonzalez's early opener.
FULL TIME. BASEL 1-1 PORTO.
90+2'. Porto get one final chance from a corner, but nothing comes from it.
90.' Four minutes of time is added on.
89'. Winding down now, Porto seem content to take a score draw back home whilst Basel look too tired to muster up a winning attack. Danilo makes it nine yellow cards for the evening.
87'. Derlis Gonzalez, below, stretching to score the games opening goal early on.
83'. SUB- Ahmed Hamoudi comes on for Gashi in Basel's third and final change.
81'. SUB- Juan Quintero replaces Cristian Tello.
79'. Samuel was on a yellow card before the incident and is possibly lucky to still be on the pitch after that handball.
79'. Danilo takes a short run up and hammers the penalty into the bottom left hand corner with ease, a crucial penalty that levels up the game!
GOAL! BASEL 1-1 PORTO (DANILO)
78'. Walter Samuel has looked a yard off the pace all night and went in too late in an attempt to block a cross, handballing it. Up steps Danilo...
PENALTY TO PORTO!
71'. SUB- Oliver Torres is forced off with a shoulder injury and goes straight down the tunnel. Ruben Neves comes on in his place.
70'. 20 minutes to go and Basel will be wishing the referee could blow his whistle now, this 1-0 result would be ideal for them. Porto, on the other hand, really need to start adding some good penetration to their possession as they search for an equaliser.
65'. Very close for Porto as Martinez finds room in the penalty area following a clever pass by Torres, his chipped effort lands on the roof of the net.
63'. SUB- Marko Streller is replaced by Breel Embolo.
62'. Marek Suchy recieves the eighth yellow card of the night, and will now miss the return leg.
61'. SUB- Yacine Brahimi goes off for a familiar face around Europe, Ricardo Quaresma. Brahimi started well tonight but struggled to make an impact after the early stages.
59'. Tello comes close for Porto, racing on to a superb Torres pass only to see his shot saved by Vaclik.
57'. There are quite a few strong tackles going in now and there has been another booking, this time for Shkelzen Gashi.
52'. Amidst the drama of the goal that wasn't, Alex Sandro has been booked for a tackle on Taulant Xhaka.
49'. After consulting with his fellow officials, Clattenburg has ruled the goal out. The decision seems to have been made on the basis that a Porto player in an offside position was blocking Vaclik's view. Looks like a good decision.
CORRECTON: NO GOAL- BASEL 1-0 PORTO
48'. After Vaclik saved the header from a corner, Casemiro flicked in the rebound to level up!
GOAL! BASEL 1-1 PORTO (CASEMIRO)
47'. Walter Samuel has been booked after a late, needless challenge on Jackson Martinez.
46'. We're underway in the second period, and Porto really need to find that crucial away goal in order to give themselves a strong chance of progressing come the second leg.
KICK-OFF
20:46. Stay tuned for the second half.
20:43. Elsewhere in Europe tonight, Real Madrid lead Schalke in Germany by a goal to nil thanks to a strike from Cristiano Ronaldo.
20:39. So at the interval the score is Basel 1-0 Porto with the hosts leading through a goal from Gonzalez. The visitors have had the majority of possession, with Basel's strong defensive line proving tough to get through.
HALF-TIME
45'. Three minutes of added time have been announced here in Switzerland.
36'. Mohamed Elneny recieves a yellow card after pulling back Oliver Torres, with Torres also recieving a yellow card for waving an imaginary yellow card at Mark Clattenburg following the foul.
35'. Cristian Tello has the ball in the net for Porto but he's offside, after making his run much too early.
30'. Penalty shout for Porto as Jackson Martinez appears to be pulled down in the area by Walter Samuel. It didn't look much at first, however replays suggest that Basel might count themselves lucky.
28'. Casimero goes into the book for a pointless lunge on Zuffi, 40 yards from the goal.
27'. STAT: Derlis Gonzalez is the youngest player with three or more goals in this seasons's UEFA Champions League. (OPTA)
24'. SUB- Davide Calla replaces Gonzalez for Basel.
22'. Frei has recieved a yellow card, the first of the game.
21'. It seems like Gonzalez will have to be replaced for Basel, having not recovered from that head injury picked up when scoring the opener.
19'. Porto full back Danilo forces a corner with a strong left-footed shot, but Casemiro's resulting header went wide.
17'. After clashing with Fabiano following the goal, Gonzalez had to recieve treatment for a couple of moments and is limping about the pitch now.
14'. The goal has come against the run of play after Porto looked more impressive in the first ten minutes, how will the Portugese giants react to this?
11'. It's Derlis Gonzalez who has put Basel 1-0 ahead, after Fabian Frei spotted his run and delivered an inch perfect pass. Gonzalez took the ball on and held off two defenders, toe-poking the ball past Fabiano to give his side the lead.
GOAL! BASEL 1-0 PORTO (GONZALEZ)
8'. Yacine Brahimi showed an early glimpse of his quality there, dribbling well down the line before overrunning the ball, leading to a goal kick.
4'. The game has started, with both sides looking keen to press the ball early on.
KICK-OFF
19:43. Handshakes have been exchanged and we're almost ready in Switzerland.
19:40. Prediction? Well, Basel have an exceptional home record and tough team, whilst Porto probably offer more attacking quality. I'm going for a 1-1 draw.
19:35. Just ten minutes to go now until kick off in this UEFA Champions League last 16 first leg!
19:30. The Porto players have joined in for a group huddle. It could be to motivate eachother ahead of the game, or simply to keep warm on a cold night in Switzerland!
19:25. For Basel, midfielder Fabian Frei will be a key player tonight. The Swiss international will be looking to follow up some impressive performances that we saw him make in the group stages.
19:20. Porto striker Jackson Martinez is sure to cause a huge threat to the Basel defence tonight. Columbian Martinez has 21 goals in 26 games this season.
19:15. Both sides have come out to warm up, with the Basel fans giving the Porto side a hostile reception.
19:10. Former Porto striker Benni McCarthy has been talking up midfielder Yacine Brahimi pre match, saying, "He's got so many weapons in his locker. Skillful, great one on one. He can be a top player."
19:07. That's a picture there of tonight's stadium, St Jakob Park.
19:03. That's both starting eleven's confirmed then, with both Basel and Porto seemingly setting up with 4-3-3 formations.
18:58. Porto's bench reads: Helton, Martins Indi, Quaresma, Quintero, Evandro, Ruben Neves, Aboubakar.
18:57. Basel's bench reads: Vailati, Degen, Ajeti, Delgado, Hamoudi, Ebolo, Calla.
18:54. BREAKING: Vaclik; Xhaka, Samuel, Suchy, Safari; Elneny, Zuffi, Frei, Gashi, Gonzalez; Streller (c).
18:48. BREAKING: Fabiano; Danilo, Maicon, Marcano, Alex Sandro; Casemiro, Hector Herrera, Torres; Tello, Brahimi, Martinez (c).
18:44. With around an hour to go until kick off in Switzerland, the teams should be announced any minute now.
18:35. Tonight's game is being held at the St. Jakob-Park stadium in Switzerland. The stadium holds just over 33,000 people and was one of the used venues at Euro 2008.
18:33. STAT: Basel coach Sousa won just two of his 12 games against Porto as a player.
18:30. The referee for tonight's game will be Mark Clattenburg, from England.
18:27. STAT: Porto join Real Madrid and Chelsea as the only unbeaten sides left in the competition, will that change tonight?
18:25. STORY SO FAR: PORTO- Porto went unbeaten in Group H as they finished on 14 points. Beating Shakhtar Donesk to top spot, Porto saw Athletic Bilbao and BATE Borisov knocked out of the competition.
18:20. STORY SO FAR: BASEL- Basel did superbly to come 2nd in a group that contained Real Madrid, Liverpool and Ludogorets. The highlight for Basel will undoubtedly be the home win over Liverpool, aswell as the draw at Anfield that saw them progress ahead of the English side on matchday six.
18:17. The last time Basel reached the last 16 of this competition, they beat Bayern Munich 1-0 at home before being outclassed 7-0 in Germany.
18:15. With the line up's set to be announced in around half an hour, take a moment to read through VAVEL's preview of the game, written by Danial Kennedy. https://www.vavel.com/en/international-football/451702-champions-league-preview-basel-vs-porto.html
18:12. Porto have no injury concerns but it is worth keeping an eye out for defenders Maicon and Marcano as the two are each a booking away from suspension.
18:10. Basel will be without centre back Fabian Schar tonight as he serves a suspension after he picked up three yellow cards in the group stage. Ivan Ivanov is also expected to be out for the hosts, as he has a knee injury.
18:07. Basel's captain Marco Streller has offered his thoughts pre match, on the rise of his club. "Basel have taken on an impressive growth and we worked very hard for all of the respect we are now being shown, It's an unbelievable situation, and we've deserved to be in it after coming through the tough group we were in. That's what makes us most proud. If we get through this round, then that would be comparable with the biggest achievement in the club's history."
18:05. STAT: Since winning the tournament in 2004, Porto have reached the knockout stage six times, losing in the last 16 on five of those six occassions.
18:00. Julen Lopetegui, Porto's coach, has spoke about the difficulty the tie poses his side. "We go into every game aiming for the win, to be the main protagonists. Basel are a complete side, they have a clear idea about how to attack and defend, and we have to put on two great performances to go through – one is not enough."
17:50. Basel coach, Paolo Sousa has challenged his side to take more risks in the final third when attacking. Sousa said, "We have to accept risks, we want to play and we must also have personality. I always bet on my team playing to win. We want to have the ball and get into the other half."
17:45. STAT: Basel have played against a side from Portugal 10 times before, scoring in only three of those games.
17:40. Porto are themselves also going for their national title, and lie in second place just four points away from rivals Benfica. They come into the game on the back of a 1-0 win over Vitoria SC last Friday.
17:35. The hosts this evening Basel enter the game with a strong eight point lead at the top of the Swiss Super League. They're unbeaten in nine games since losing to Real Madrid in the UEFA Champions League.
17:30. Hello everyone and welcome to the VAVEL live commentary of the UEFA Champions League last 16 first leg tie between Basel and Porto. My name is Oliver Emmerson and I will be taking you through the evening's proceedings.