Omens favour Manchester City for Shakhtar visit Manchester City and Shakhtar Donetsk both recorded impressive victories on matchday one, although history suggests it will be a tough evening for the visitors in England.
Napoli in need of Feyenoord fillip Both Napoli and Feyenoord lost in the opening round of Group F matches, and need a quick response as they meet for the first time at the Stadio San Paolo.
Sporting steeled for Barcelona challenge Sporting opened Group D with an impressive away victory but must now entertain a Barcelona side who won 5-2 on their last trip to the Estádio José Alvalade.
Juventus out to extend Olympiacos dominance Juventus have won all four previous games against Olympiacos in Turin, and could do with prolonging that record with both side playing catch-up in Group D.
Messi scores four, Bayern pull rank Lionel Messi struck his 39th hat-trick for Barcelona in a four-goal haul against Eibar on a night when Bayern triumphed at Schalke and Liverpool lost in the English League Cup.
How will Bayern manage without Manuel Neuer? Bayern München goalkeeper Manuel Neuer has been ruled out until January after breaking a bone in his foot in training. Who will stand in for him in the UEFA Champions League?
UEFA Champions League all-time top scorers Cristiano Ronaldo and team-mate Karim Benzema are both among the all-time leading scorers in UEFA's top club competition, with Lionel Messi the only non-Real Madrid man in the top five.
Atlético open new home with Chelsea contest Atlético will be hoping to transfer their proud European home record to their new stadium, the Estadio Metropolitano, as old rivals Chelsea pay a Group C visit.
Spartak Moskva and Liverpool search for Group E lift-off It has been honours even in the four previous meetings between Spartak Moskva and Liverpool, with both sides now eager to pick up a first victory in Group E.
Qarabağ relishing Roma opportunity Qarabağ are eager to mark their first home game in the UEFA Champions League group stage with a positive result against Roma, who have struggled on their travels.
Sevilla await Maribor again Sevilla got the better of Maribor in their victorious 2013/14 UEFA Europa League campaign, and could do with a repeat of that home victory as the teams reunite in Group E.
Who has scored 50+ UEFA club goals? Sergio Agüero's goal for Manchester City on matchday one bought him a seat at one of the most exclusive tables in European football; meet the top UEFA club competition scorers.
Basel and Benfica need Group A boost History is on Benfica's side as they take on Basel at St. Jakob-Park in the second round of games, with both looking to get off the mark in Group A.
Agüero, Dybala reach milestones, Paris stay perfect Sergio Agüero and Paulo Dybala both scored hat-tricks in landmark outings for Manchester City and Juventus, while Paris Saint-Germain beat Lyon thanks to a pair of own goals.
CSKA and Manchester United seeking second win Having both won their opening Group A fixtures, CSKA Moskva and Manchester United are looking to cement their position as early pacesetters when they meet in Russia.
Paris and Bayern out to lay down marker Having both recorded comfortable wins on matchday one, Paris Saint-Germain and Bayern will be aiming to make a statement of intent when they meet for the first time since 2000.
Anderlecht and Celtic in need of Group B lift-off Both Anderlecht and Celtic suffered heavy defeats on matchday one and each is in need of three Group B points as they meet for the first time since 2003 in Belgium.
How will Barcelona cope without Dembélé? With new signing Ousmane Dembélé ruled out until the new year with a hamstring injury, Barcelona face a selection dilemma; Joe Walker runs through Ernesto Valverde's options.
UEFA Champions League group stage records Iker Casillas and Lionel Messi go into the 2017/18 UEFA Champions League as the twin titans of the group stage; keep tabs on all the records at this level.
Champions League podcast: Kane and Ronaldo star We hear from Jürgen Klopp, Harry Kane, Unai Emery, Romelu Lukaku and Ernesto Valverde as our panel review matchday one in the official podcast.
Babel seals new record goals tally for matchday one Ryan Babel's clincher in Beşiktaş's 3-1 win at Porto was the 54th and final goal from 16 games on matchday one, surpassing a high-water mark set in 2013/14.
Opening wins for Madrid, Spurs, City and Beşiktaş Cristiano Ronaldo and Harry Kane both scored twice in wins for Real Madrid and Tottenham respectively, with the more surprising figure of John Stones also at the double for Manchester City.
Sevilla grab point from profligate Liverpool Joaquín Correa prised a 2-2 draw for Sevilla at Anfield after Liverpool spurned a clutch of chances and missed a penalty in a pulsating opening Group E contest.
Kane at the double as Tottenham edge out Dortmund Harry Kane was the difference in a high-octane encounter as his two goals helped Spurs see off Dortmund and further quell talk of a Wembley hoodoo.
Possible line-ups and team news for Wednesday Who's likely to start, who might be left out and who is unavailable? UEFA.com gives Fantasy Football managers a helping hand by predicting all the line-ups for the second set of games.
Champions League podcast: Back with a bang Hear from Romelu Lukaku, Carlo Ancelotti and José Mourinho as we review a goal-laden return of the competition in the official UEFA Champions League podcast.
Messi leads way as Chelsea, Paris open in style Lionel Messi and Neymar may no longer be team-mates but both wasted no time in getting on the scoresheet as Barcelona, Paris, Bayern, Manchester United and Chelsea were among the opening winners.
Lukaku shines as United brush Basel aside Romelu Lukaku and Marouane Fellaini both scored then combined to set up a third goal as Manchester United returned to the UEFA Champions League with a routine 3-0 victory at home to Basel.
Alisson keeps Atlético at bay as Roma make their point Alisson Becker enjoyed a group stage debut to remember as a string of fine saves, most notably denying Antoine Griezmann and Luciano Vietto, earned Roma a point.
Messi double helps Barcelona beat Juventus Lionel Messi scored twice to take his European club competition tally to 99 as Barcelona made a strong start to their campaign with a 3-0 win against last season's runners-up Juventus.
Liverpool v Sevilla: line-ups, where to watch, form guide "They've done an outstanding job in the last few years," is Jürgen Klopp's comment on Sevilla as the 2016 UEFA Europa League finalists are rematched.
Tottenham v Dortmund: line-ups, where to watch, form guide It may be Tottenham's first game of the campaign, but for manager Mauricio Pochettino the opening-night visit of Borussia Dortmund to Wembley is "like a final".
Roma v Atlético: line-ups, where to watch, form guide Twice runners-up in the past four seasons, Atlético Madrid start their latest campaign at Roma with coach Diego Simeone as bullish as ever: "Our motivation is to win the Champions League."
Possible line-ups and team news for Tuesday Who's likely to start, who might be left out and who is unavailable? UEFA.com gives Fantasy Football managers a helping hand by predicting all the line-ups for Tuesday's games.
Manchester United v Basel: line-ups, where to watch, form guide Manchester United are back in their "natural habitat" after one year away according to José Mourinho, but they won't have fond memories of facing Basel in this competition.
Barcelona v Juventus: line-ups, where to watch, form guide "Two of the most powerful teams in Europe" according to Ernesto Valverde, Barcelona and Juventus open their 2017/18 campaigns in a repeat of last season's quarter-final.
How to pronounce the players' names correctly English speakers tend to mangle foreign names; UEFA.com cracks more rocks of ignorance and makes the toughest group stage players' names seem simple.
Where to watch the UEFA Champions League Fans have no need to miss a single minute of the action in the 2017/18 UEFA Champions League, with broadcasters across the world screening the games live.
Messi and City shine, Bayern and Monaco stunned There were surprise defeats for Bayern and Monaco on the last weekend before the group stage, plus a big win for Manchester City against Liverpool and a Lionel Messi hat-trick.
#UCL matchday one: all you need to know The UEFA Champions League group stage kicks off with Manchester United and Chelsea back, and Ronaldo looking to lead Real Madrid to a third successive title.
Madrid memories have APOEL dreaming again With APOEL in the group stage for the first time in three years, memories of their most famous European campaign will be stirred when they visit holders Real Madrid on matchday one.
Tottenham need home improvement for Dortmund visit Tottenham won only one of their four European home matches in 2016/17 and will be looking to improve on that record when Borussia Dortmund come to Wembley.
Porto defend unbeaten record as Beşiktaş come to town Porto will hope to extend their record of never having lost to Turkish opposition in eight previous matches when they kick off Group G with a visit from Beşiktaş.
Newcomers Leipzig start with Monaco task RB Leipzig have prestigious visitors for their European debut, with French champions Monaco – semi-finalists last season – coming to town on Group G's opening night.
Liverpool aim to start with Sevilla success Liverpool are back in the UEFA Champions League after three years away and kick off Group E at home to a Sevilla side who beat them in the 2016 UEFA Europa League final.
Feyenoord face Manchester City in group return Back in the group stage after 15 years, Dutch champions Feyenoord face a daunting-looking return against a Manchester City side with designs on a knockout place again.
Napoli head east for Shakhtar opener For the second year running, Napoli are in Ukraine on matchday one and, having won at Dynamo Kyiv 12 months ago, they will be keen to repeat the trick at Shakhtar Donetsk.
Maribor and Spartak Moskva meet in Group E Maribor and Spartak Moskva have never met before and both teams will be eager to hit the ground running when Group E gets under way in Slovenia.
Rapid reunion for Barcelona and Juventus Barcelona begin the new UEFA Champions League season as they ended the old as Juventus, who triumphed in last season's quarter-finals, visit the Camp Nou.
Old hands Chelsea face Qarabağ newcomers Back in the group stage after missing out last season for the first time since 2002/03, Chelsea open Group C with a home game against debutants Qarabağ.
Manchester United return with Basel visit Having qualified as UEFA Europa League winners, Manchester United return to the group stage with a home game against a Basel side who have proved tricky opponents in the past.
Roma return with Atlético opener Having missed out on last season's group stage, Roma will be hoping for a winning start to Group C, although Atlético Madrid are likely to prove obdurate opponents.
Olympiacos and Sporting CP seek winning start With two of Europe's big guns to come in Group D, both Olympiacos and Sporting CP know how valuable three points would be as they meet for the first time.
Celtic kick off with Paris challenge Celtic's recent home record in the group stage is in need of improvement, but they begin Group B with a daunting visit from Paris Saint-Germain and their new signing Neymar.
Bayern braced for Anderlecht visit Bayern München are aiming to revive their masterly home record as they welcome an Anderlecht side back in the group stage after a two-season absence.
Benfica welcome CSKA Moskva on opening night Regular participants in the group stage over the past few seasons, Benfica and CSKA Moskva will be hoping for a positive start when they kick off Group A in Lisbon.
Champions League group stage squads confirmed UEFA Champions League Fantasy Football managers, take note – the 32 group stage sides have confirmed their squads. Check them out and then pick your team!
Champions League group stage sides' transfers Keep track of all the ins and outs this summer for the 32 clubs eager to strengthen their squads ahead of the UEFA Champions League group stage as the transfer deadline arrived.
Why Paris made their move for Kylian Mbappé With Paris agreeing a loan deal for Monaco forward Kylian Mbappé, UEFA.com runs the rule over the sensational youngster who took Europe by storm last season and now has his first France goal.
All you need to know: Champions League group stage squads Once the transfer window shuts, the attention for many – not least Fantasy Football managers – turns to teams naming their UEFA Champions League squads. UEFA.com explains the process.
