The Champions League group stage concludes with Wednesday's Matchday 6 clashes, with the last 16 of the competition looming large.

Read on for match previews and how to watch all eight games on BT Sport.

NEW NAME. SAME GAME.

Watch TNT Sports' unbeatable line-up of world-class live sport for just £29.99 a month.

Zenit vs Chelsea, 5.15pm (KO 5.45pm) on BT Sport 3HD - Watch live stream

Are Chelsea beginning to feel the pressure? A five-point lead at the top of the Premier League has evaporated after a run of one win in three matches and Chelsea have been supplanted at the top of the table by defending champions Manchester City.

A 1-1 draw with Manchester United was followed by a less-than-convincing victory over Watford before the weekend's 3-2 defeat at West Ham, in which Edouard Mendy was at fault for two of the goals.

But if Thomas Tuchel is worried, he's not showing it. The German has the solution.

"It’s details and you can always solve the details," Tuchel said after the West Ham defeat. "There is no need to question the big picture and no need for major doubts.

"In my opinion, it’s obvious why we did not have the result that we wanted against Man United and West Ham so it’s about details. That’s why I think we can sort it out straightaway."

Sorting it out straight away begins in St Petersburg where Chelsea round off their Champions League group-stage campaign looking to secure top spot and a seeded qualification place in the knockout stages. 

After a 4-0 hammering of Juventus at Stamford Bridge, Tuchel's men are level on points but above the Italians so should they match or better The Old Lady's result against Malmo they clinch top spot.

Yet with such a busy December schedule awaiting, the German may well be tempted to shuffle his pack at the Gazprom Arena with qualification already sewn up.

Zenit meanwhile are all-but secure in a Europa League spot barring a surprise Malmo win in Turin and will be out to avenge a 1-0 defeat to Chelsea at Stamford Bridge from the opening matchday.

Paulo Dybala has scored two in two in Serie A.
Paulo Dybala has scored two in two in Serie A.

Juventus vs Malmo, 5.30pm (KO 5.45pm) on BT Sport 1HD - Watch live stream

It was a humiliating, yet not altogether surprising, result that highlighted just how far behind Europe's elite Juventus are in the 2021/22 season.

A 4-0 destruction at Stamford Bridge a fortnight ago felt like a landmark result as Juve were out-thought, out-fought and embarrassed in west London.

Massimiliano Allegri's men had won four from four in the Champions League prior to the Chelsea defeat, including a 1-0 win over the defending European champions on Matchday 2.

Yet Juve's domestic season has been far worse and The Old Lady currently sit fifth in Serie A, 11 points off league-leaders and Allegri's former side AC Milan. 

Italy's most successful team have steadied the ship with back-to-back 2-0 wins over the league's bottom two sides Salernitana and Genoa. 

Paulo Dybala netted in both those matches and the Argentine is quietly becoming Juventus' most effective goalscorer this term.

And crucially, they've made the knockout stages and sit below Chelsea in Group H only on goal difference meaning they can still sneak into top spot.

The good news? They are facing a Malmo team in Turin who've collected only one point this campaign and should they better Chelsea's result in St Petersburg, they'll claim top spot and a seeded place in the knockout rounds.

Man United vs Young Boys, 7pm (KO 8pm) on BT Sport 2HD & UltimateWatch live stream 

"Exceptional" was how Manchester United's new interim coach Ralf Rangnick described his side's performance against Crystal Palace on Sunday. 

The German was taking charge of Man United for the first time after complications with his work permit delayed his presence on the touchline and was mightily impressed with what he saw at Old Trafford.

The 1-0 win came courtesy of a brilliant late winning goal from midfielder Fred, who has divided opinion in Manchester, while all eyes were on Cristiano Ronaldo amid question marks as to whether he would cope in the German's pressing system. 

Rangnick's verdict? "Cristiano Ronaldo's work off the ball? Chapeau".

The interim coach gets another chance to implement his ideas on Wednesday night when an already-qualified Man United host a Young Boys side at The Theatre of Dreams.

The 2-0 win away in Villarreal a fortnight ago, courtesy of late goals from Jadon Sancho and Ronaldo, secured United's passage into the last 16 despite a series of largely underwhelming performances.

The difference has undoubtedly been the presence of the competition's all-time top scorer in their ranks and Ronaldo's three late interventions in Matchday 2, 3 and 4 claimed two wins and a draw for the Premier League giants.

In fact, Ronaldo has netted in all of Man United's five Champions League games this term but may not be given the chance to make it six from six come Wednesday night.

Rangnick's men are already through to the last 16 as winners of Group F so with a gruelling schedule coming up, the German may look to rotate his side. A chance for Donny van de Beek perhaps?

Jadon Sancho scored his first Champions League goal for the club in the 2-0 win over Villarreal.
Jadon Sancho scored his first Champions League goal for the club in the 2-0 win over Villarreal.

Bayern Munich vs Barcelona, 7.45pm (KO 8pm) on BT Sport 3HD - Watch live stream

Two serious heavyweights of European football meet in Munich on Wednesday night in a do-or-die match for fallen giants Barcelona.

Las Blaugranas have long since dropped from the perch of regular contenders for the trophy, yet with failure to qualify for the knockout stages for the first time in 20 years staring Barcelona in the face, it could be about to get worse for Xavi's men.

Two 3-0 defeats to begin the campaign, against Bayern and Benfica, left Barca with plenty to do and they responded by defeating Dynamo Kyiv home and away before escaping with a goalless draw at home to Benfica.

It means the La Liga outfit occupy second spot, sitting two points ahead of the Portuguese giants in Group E. The bad news is that Benfica host bottom side Dynamo at home, whereas Barcelona travel to Bayern Munich.

Bayern have won all five of their matches in this season's competition, scoring 19 times and conceding just three in the process. They thrashed Barcelona 3-0 in Spain and in truth, might've scored four or five that night.

In a game that Barcawill likely need a result from to ensure passage into the knockout stages, Xavi's biggest hope will be that Bayern choose to rest some of their stars for the clash.

Bayern have long been assured of top spot and as they fight on all fronts in Germany, Julian Nagelsmann may see this as a chance to rest the likes of Robert Lewandowski, Leroy Sane and Thomas Muller. Barcelona can only hope...

Bayern have been imperious in the Champions League so far this season.
Bayern have been imperious in the Champions League so far this season.

Atalanta vs Villarreal, 7.45pm (KO 8pm) on BT Sport ESPN HD - Watch live stream

While there's little in the way of peril for Manchester United in the home clash with Young Boys, there's plenty to still be determined in Group F. 

Villarreal head to Bergamo for a winner-takes-all shootout for the remaining last-16 spot between the Spaniards and the Italians. 

Unai Emery's Europa League winners Villarreal currently occupy second spot but sit just a point above Atalanta knowing a win or draw would be enough to see them advance.

Villarreal's seven points have come via two wins over bottom side Young Boys and draw with Wednesday's on Matchday 1, yet Emery's men have been far from convincing in recent outings. 

The 2006 Champions League semi-finalists sit 13th in La Liga after a paltry three victories all season and have not won an away league game all campaign.

In contrast, Atalanta enter the tie off the back of five domestic wins on the trot, including over Juventus and Napoli, and will fancy their chances of downing the Yellow Submarine on home turf.

And with 16 goals scored in their previous five matches in all competitions, Gian Piero Gasperini's side know only one way to win. It promises to be a fascinating encounter at the Gewiss Stadium.

Benfica vs Dynamo Kyiv, 8pm on BT Sport Extra 2HD - Watch live stream 

With Group E reaching it's climax, Benfica host Dynamo Kyiv in Lisbon looking to make the last 16 of the Champions League for the first time since the 2016/17 season.

The Portuguese giants must defeat Dynamo and hope that Barcelona don't pull off a surprise victory away at Bayern Munich to seal qualification for the last 16. 

Should Barca draw in Munich and Benfica win, it will be the Portuguese side who make the knockout stages given they hold a superior head-to-head advantage over the Catalan giants from the 3-0 drubbing they inflicted on them back in late September.

The worry for Benfica will be that Bayern, already assured of top spot, will rest players for the visit of Barcelona and give the Spaniards the impetus to claim a surprise result.

All Jorge Jesus' men can do though, is worry about themselves. Benfica must do what they could not manage in Ukraine on Matchday 1 and defeat Dynamo.

Benfica had the better of the goalless draw in Kiev yet couldn't find a way past Mircea Lucescu's side at the Olympic Stadium in a result that could come back to haunt them.

Dynamo have little to play for but enter the contest on a run of three straight domestic wins which has seen them net 11 times and they escaped from the home tie against Bayern Munich with a 2-1 defeat - an impressive result given how brilliant the Germans have been in Europe thus far.

RB Salzburg vs Sevilla, 8pm on BT Sport Extra 3HD - Watch live stream

Two sides in the wide-open Group G, RB Salzburg and Sevilla, meet in Austria with it all still to play for on Matchday 6.

Sevilla looked for all the world to be crashing out in the group stages after collecting just three points from four matches to begin the campaign.

Yet a huge win over Wolfsburg a fortnight ago has propelled them right back into contention for qualification and the Europa League specialists are in with a real shout of advancing.

Opponents RB Salzburg looked to be sailing through meanwhile with seven points from their opening three, yet two consecutive defeats mean the Austrian's place in the knockout stages is in serious danger. 

Salzburg will still advance should they avoid defeat against Sevilla and have a shot at finishing top if they claim victory and Lille don't beat Wolfsburg in Group G's other match.

For Sevilla, the task is simple. Julen Lopetegui's men will go through if they win and can claim first place should they win and Lille lose in Germany. 

So nothing is certain as we head into what promises to be a dramatic climax to Group G with knockout spots up for grabs for all four sides.

Wolfsburg vs Lille 8pm on BT Sport Extra 4HD - Watch live stream

The Champions League's most watertight group concludes on Wednesday night with permutations aplenty between the four sides in Group G. 

What looked an open group on paper has proved so, with three points separating Lille in top spot and Wolfsburg who sit bottom of the table.

And it's the Germans who visit the French side in Matchday 6 in a straight shootout for qualification for the knockout stages. 

Florian Kohfeldt's Wolfsburg, despite sitting bottom on five points, will advance if they overcome Lille on home turf and can even finish top should they win and RB Salzburg's meeting with Sevilla ends in a draw.

The defending French champions Lille will advance if they avoid defeat to Wolfsburg and can claim top spot and a seeded place in the knockouts should they win and Salzburg fail to defeat Sevilla.

It was a tense affair in Matchday 1 when these two met, with a goalless draw in north-west France that saw Lille completely dominate proceedings. 

Jocelyn Gourvennec's men recorded 17 shots but couldn't find a way past Wolfsburg - who were reduced to 10 men just past the hour mark but still held on to a point.

It's a result that could have huge ramifications come the conclusion on Wednesday night as both teams go for the coveted prize of a last-16 spot in Europe's greatest club competition.