Champions League: Barca, PSG and Man City under pressure to win 

Holders Real Madrid will launch their Champions League defence in Glasgow when this season's group stage gets underway on Tuesday evening.

Real have won five of the last nine editions and, under the wily Carlo Ancelotti, are likely to be one of the teams to beat again.

Having beaten Liverpool at the Parc des Princes last May, Ancelotti goes in search of a fifth title as a manager.

Madrid face Scottish champions Celtic in their opening Group F fixture while on the same night Paris Saint-Germain and Manchester City set out on their latest quest to lift European club football's biggest prize for the first time.

With a look at some of the talking points ahead of the long road to Istanbul, Sky Sports reflects on which team is feeling the most pressure to deliver on Europe's biggest stage...

Holders Real Madrid have made a strong start in La Liga, winning all four of their matches - beating Real Betis 2-1 in their most recent encounter.

"I've not seen any weaknesses in Madrid so far this season," Spanish football expert Semra Hunter told Sky Sports. "They look really good and really solid.

"They've taken four wins from four, the only team in La Liga to have picked up 12 points so far. On top of that, they've already picked up a piece of silverware at the start of the campaign so really, it's five from five.

"They're just really difficult to beat. Ancelotti always seems to have a Plan B and a Plan C up his sleeve when something isn't working in a game.

"He knows how to change it, he's really good at reading the in-game situation. In the last couple of fixtures, his substitutions have been spot on in terms of swaying matches in their favour.

"If there was a slight weakness - but it is only slight - is that in the past two games, Karim Benzema has looked slightly off it. But having said that, he still scored a brace the other day.

"So it's going to be very difficult to find a way of getting through this Real Madrid side. They're scoring goals and they're keeping clean sheets as well. It's very difficult for opponents to find any cracks in their armour.

"It's going to be a very tough game for Celtic, even though they're going to be playing at home."

Real's run to the final last season was a tale of resilience and adapting in the face of adversity.

They were heading out at the last-16 stage when Benzema's 15-minute hat-trick stunned PSG, there was the comeback win over Chelsea followed by a bizarre stoppage-time recovery to knock out Manchester City in the semi-finals.

Casemiro was allowed to join Manchester United in the summer, but his departure has been absorbed. Real have adapted again.

Celtic manager Ange Postecoglou insists they will continue to play their style of football when they face Real Madrid in the Champions League.

"They've done exceptionally well and did their business very early in the window," Hunter continues. "They brought in Aurelien Tchouameni from Monaco, spending €80m on him.

"The idea was that progressively over the next few years they would ease him into the position as they transitioned Casemiro out. But obviously, that hasn't happened.

"He's had to hit the ground running and he's been thrown into the deep end with Casemiro deciding to leave. He's done a great job over the last few games. At first, he was a little bit nervous but he's been shaking off the nerves, growing in confidence and making the role his own."

Madrid's 14th European Cup brought into ever sharper focus the ongoing wait for glory at Manchester City, who are competing in the Champions League for a 12th season - all coming in a row since 2011/12.

Only Real (26), Barcelona (19) and Bayern Munich (15) are on longer ongoing runs of consecutive appearances in the competition, and they should find negotiating Group G easier than it appears on the surface - not least because they have directly weakened one of their opponents.

City's hand has been strengthened significantly by the summer addition of £51m striker Erling Haaland. The Norway international has an outstanding record in European club competitions, having scored 27 goals in 25 appearances for Molde, Red Bull Salzburg and Borussia Dortmund

In his opening six games in the Premier League, Haaland has plundered 10 goals, including back-to-back hat-tricks against Crystal Palace and Nottingham Forest.

History suggests the flow of goals is unlikely to dry up as Pep Guardiola's men prepare to open their campaign at Sevilla.

He scored three times on his Champions League debut for Salzburg against Genk in September 2019, and helped himself to a double against PSG in his first appearance in the competition for Dortmund in the February of the following year.

Champions League success has eluded City, but Haaland's arrival will ramp up the pressure on Guardiola to take his side to a second final this time around, and go one better than they did in 2021 when Chelsea overcame them in Porto.

Tottenham's group might on initial viewing not look out of place in Europe's secondary competition, but Marseille are a reviving force with a clear pattern that has taken them to second in Ligue 1 only on goal difference to PSG after six games.

It is the same top two as how the league finished last term, but unbeaten Olympique look determined to go one better this time around. Chile's most capped player and all-time top scorer Alexis Sanchez joined as a free agent this summer.

There will be plenty of familiar faces on show when Tottenham play host on Wednesday night with Dimitri Payet, Cengiz Under, Matteo Guendouzi, Jordan Veretout, Sead Kolasinac, Eric Bailly, Nuno Tavares and ex-Spurs goalkeeper Pau Lopez among the former Premier League players set to feature.

Frankfurt qualified for the group stage of the Champions League for the first time, although they did reach the European Cup final in 1960, when they were beaten 7-3 by Real Madrid at Hampden Park.

They look a weaker side, however, having since lost star man Filip Kostic to Juventus and went down 6-1 at home to champions Bayern Munich in their opening Bundesliga fixture last month.

If there is pressure at Spurs, it will be from Antonio Conte on himself to deliver. The Italian has won just 12 of his 54 matches in Europe's elite club competition - and only once has a side under his management won a knockout fixture - his Juventus beat Celtic back in 2013.

His former club Chelsea are a team in transition who may view this competition not only as a welcome escape from the Premier League, but also as one which Thomas Tuchel's squad is better suited to.

The slower pace could help Kalidou Koulibaly adapt at his new club alongside Wesley Fofana. Too many Chelsea players appear to be out of form at present but their group is a kind one.

Visiting Dinamo Zagreb on matchday one should allow for confidence to build ahead of back-to-back games against AC Milan - their toughest opponents - in October.

Rangers, edged out on penalties by Eintracht in last season's Europa League final, are back in the group stage for the first time since 2010, and they are accompanied by Old Firm rivals Celtic, a feat the pair last achieved in 2007.

Finishing in third place with the consolation of a Europa League knockout round play-off should not be the height of their ambitions.

In Group A, Napoli could prove dangerous opponents for Liverpool, who start their campaign with a trip to Italy.

For a third time in the last five seasons, the two teams have been drawn in the same Champions League group; the Reds won just one of the four meetings in 2018/19 and 2019/20.

Napoli's 21-year-old Georgian winger Khvicha Kvaratskhelia is already making an impact in Serie A and Jurgen Klopp's side are without an away Premier League win having lost at Manchester United in between draws at Fulham and Everton.

Paris Saint-Germain, like City, have invested heavily in their pursuit of the biggest prize of all, but despite their domestic dominance and final appearance in 2020 - falling to a narrow defeat at the hands of Bayern Munich - the yearning remains unrequited.

If PSG prosper this season, Lionel Messi will have a major personal landmark in his sights. The 35-year-old has 125 Champions League goals to his name to date, 15 fewer than Cristiano Ronaldo at the top of the pile.

However, Ronaldo will not add to his tally with Manchester United having qualified only for the Europa League, handing Messi a chance to close the gap.

While Mauricio Pochettino would rarely replace Messi, Kylian Mbappe or Neymar, his successor Christophe Galtier didn't hesitate to put the Brazilian on the bench on Saturday against Nantes, three days before their Champions League opener against Juventus.

Galtier had warned the team would come first, and he has been true to his word as PSG scored a record 24 goals in their opening six league matches.

"I talked about it twice - once with each of them and once with the whole squad, to tell them that this is how it was going to be and that we had to have the right attitude and accept it," said Galtier, who knows failure to qualify from a group containing Juventus, Benfica and Maccabi Haifa is unthinkable.

Barcelona have not won the competition since 2015 and failed to progress beyond the group stages for the first time since 2000/01 last season.

Having slipped into the Europa League, the Catalans reached their nadir when they were beaten by eventual winners Frankfurt in the quarter-finals amid farcical scenes at the Camp Nou where 30,000 visiting fans made it feel more like a home game for the Bundesliga outfit.

But Barcelona - who start their campaign with a home game against Czech side Viktoria Plzen on Wednesday - have been boosted by a huge summer overhaul spearheaded by the arrival - and instant impact - of Robert Lewandowski.

Like Haaland, Lewandowski can look forward to an instant reunion with his former club - Barcelona head to face Bayern Munich on Tuesday, September 13. Sadio Mane has started life in Bavaria well, scoring five goals in seven appearances.

With Inter Milan completing Group C, expect plenty of fireworks to accompany the many sub-plots.

Matchday 1 fixtures and tables

Tuesday September 6

Group E

Chelsea

Dinamo Zagreb

Salzburg

AC Milan

Dinamo Zagreb vs Chelsea (5.45pm)

Salzburg vs AC Milan (8pm)

Group F

Celtic

RB Leipzig

Shakhtar

Real Madrid

RB Leipzig vs Shakhtar (8pm)

Celtic vs Real Madrid (8pm)

Group G

Man City

Sevilla

Borussia Dortmund

Copenhagen

Sevilla vs Man City (8pm)

Dortmund vs Copenhagen (5.45pm)

Group H

PSG

Juventus

Benfica

Maccabi Haifa

PSG vs Juventus (8pm)

Benfica vs Maccabi Haifa (8pm)

Wednesday September 7

Group A

Liverpool

Napoli

Ajax

Rangers

Napoli vs Liverpool (8pm)

Ajax vs Rangers (5.45pm)

Group B

Atletico Madrid

Porto

Club Brugge

Leverkusen

Atletico Madrid vs Porto (8pm)

Club Brugge vs Leverkusen (8pm)

Group C

Barcelona

Viktoria Plzen

Inter Milan

Bayern Munich

Barcelona vs Plzen (8pm)

Inter Milan vs Bayern Munich (8pm)

Group D

Tottenham

Marseille

Frankfurt

Sporting CP

Tottenham vs Marseille (8pm)

Frankfurt vs Sporting CP (5.45pm)