The UEFA Women's Champions League (UWCL) returns on Tuesday, as Europe's biggest clubs battle to lift the continent's biggest prize once again.
Barcelona are the reigning champions, having reclaimed the title from Arsenal in Oslo in May, but the plot has thickened since then after an astonishing transfer window that saw some of the game's biggest stars swap clubs.
The stage is set for another great UWCL campaign, but which players will ultimately decide who comes out on top? Here is one "X factor" for each team, meaning the player whom each club's success is most hinged upon.
Barcelona: Patri Guijarro, CM
Barcelona have been a constant fixture in recent UWCL finals, playing in every single one this decade. They managed to beat OL Lyonnes in May to reclaim their throne as the European champions, but after captain Alexia Putellas and forward Salma Paralluelo left in the summer, this season's campaign will be decided by others.
So much of Barcelona success will boil down to midfield general Patri. She is the glue in their three-player midfield and the protector that allows Barcelona's attack to flood forward and overload defenses. She has an extraordinary ability to cover large areas of the pitch and recover possession, and is nicknamed "The Octopus" for good reason.
Barcelona are a team known for their technical strength, but it is their selfless work -- particularly from Patri -- that forms the foundation which allows them to be the best women's team in the world.
Real Madrid: Linda Caicedo, FW
Real Madrid have been a constant part of the Women's Champions League since their competition debut in 2021-22, though they are yet to make it as far as the semifinals. But could that change this season?
If Madrid are to reach new heights, they'll need star forward Caicedo on top form. The Colombia international can be the difference in big games, and her teammates will sometimes need to just sit back and hope she can provide a single moment of brilliance. She is among the best in the world at taking on defenders in one-vs.-one situations and is an excellent outlet on the counter attack.
The departure of midfielder Caroline Weir, who became the club's all-time leading scorer last season, has only increased Caicedo's importance. It can sometimes be difficult for the club to match the talent of some of Europe's powerhouse clubs, but in Caicedo they have a real star.
Manchester City: Yui Hasegawa, CM
After not featuring in the Women's Champions League last season, Manchester City return as the champions of England. Their star player is in no doubt: STRIKER Khadija "Bunny" Shaw spearheaded the team with 21 goals and four assists and is a contender to win the Ballon d'Or Féminin, but their X-factor is Hasegawa.
The Japan international is City's heartbeat and orchestrator, running the show from the base of their midfield. She progresses the ball up the pitch, and her outstanding positional awareness allows her to play quick exchanges and support play in every phase.
Last season she was given some license to attack, meaning she ended the season with two goals and two assists in the WSL, but her impact is far from limited to the scoresheet.
Chelsea: Lauren James, AM/FW
Chelsea will be looking to shake off a challenging 2025-26 season under manager Sonia Bompastor, where they struggled to score and suffered glaring frailties in defense. While the transfer window saw the club make efforts to address those issues -- they signed full back Katie McCabe, midfielder Manaka Matsukubo and forward Melvine Malard -- getting forward James back to her best could have the biggest impact.
James is blessed with incredible finesse on the ball and is perhaps Chelsea's most creative player, who can help to deliver chances from any situation. Her issue has been that she has played less than 500 minutes in the UWCL over the past two seasons amid injury issues. But a fit and healthy James would be a huge benefit to Chelsea.
Arsenal: Olivia Smith, FW
Arsenal were unable to defend their 2024-25 crown last season, but they're hoping this year may be different, with an active summer transfer window providing every reason for confidence.
One of Arsenal's main concerns last year was their underwhelming performance in front of goal, and tt has carried over into this season: So far they have attempted 60 shots through their first three games in the Women's Super League, but only 22 have been on target. Worse still, they've only scored two goals.
If Arsenal's European campaign is to be more successful this season, then forward Smith will need to help them convert chances. The 22-year-old Canada international arrived from Liverpool in a club-record £1 million deal in July 2025, has explosive acceleration and is a threat with either foot from both close and long range. But her underwhelming total of eight goals in all competitions last season will need to improve.
Bayern Munich: Klara Bühl, FW
Bayern continue their hunt for their first European final and trophy, despite being a regular fixture in the late knockout rounds. The German champions have a dynamic attack, with a mix of youth and experience under manager Jose Barcala, and winger Bühl is the focal point of the attack.
Her relentless dribbling and ability to get shots away make her a constant threat, and her stats back it up: She led both the Frauen-Bundesliga and the UWCL for assists last season, recording 22 across both competitions, and already has two goals and four assists from four league games this season.
OL Lyonnes: Melchie Dumornay, CM/AM
The eight-time European champions last won the Champions League in 2021-22, but have an incredible array of talent at their disposal. And it is hard to argue any of them are more influential than midfielder Dumornay.
The 23-year-old Haiti international provides the dynamism and balance Lyonnes need. It's not often you talk about a star player as being versatile -- typically the team revolves around them, rather than the other way around -- but Dumornay's ability to fill gaps in attack and midfield helps to transform her side.
Dumornay is a manager's dream, with no ceiling on her prodigious talent: She can carry the ball forward, is equally potent from both open play and set pieces and can recover possession in the final third.
Paris Saint-Germain: Merveille Kanjinga, FW
PSG have been on a downward trajectory over the last few seasons as they failed to pick up a single win in last season's league phase and fell outside the top two in the French top flight. And the 2023-24 semifinalists will probably struggle again due to their poor squad planning.
Still, Kanjinga produced 11 goals and eight assists domestically last season, and was influential from the right flank. The 23-year-old Congo DR international loves to go on marauding runs with the ball and has a really good low driven shot in her locker. She loves to gallop down the field in transition situations and is productive with her final action in most cases. She is also a potent aerial target on set-pieces, adding to her value.
Paris FC: Clara Mateo, FW
Paris FC have firmly established themselves as a top-three side in France under the tutelage of manager Sandrine Soubeyrand. They finished behind OL Lyonnes last season, and captain Mateo was at the center of everything good they did; she led the team for goal contributions last season, scoring eight times and assisting another four.
The 28-year-old France forward is adaptable to the players around her. She has been at the club for a decade now and has played across the front line, while her tactical and spatial awareness allows her to find pockets of space in the final third and make well-timed runs into the box.
Roma: Manuela Giugliano, CM
Roma arrive as Italian champions this season after a disappointing European campaign last term where they conceded 19 goals and scored just nine. There might be little hope of limiting the number of goals they concede -- their defence continues to look worrisome -- but there is a chance they'll be more free-flowing in attack.
Italy international Giugliano is Roma's most involved player when in possession. A right-footed midfielder, she is blessed with an impeccable passing range and is not afraid to take risks. Previously used as an attacking midfielder, she is now a deep-lying playmaker, but has retained her vision for forward passes.
Inter Milan: Marija Milinković, CB
Inter will be thankful to have made it this far. They were underdogs against Wolfsburg in the final qualifying round, but overcame a two-goal deficit in the first leg before knocking the German side out on penalties.
It was center back Milinković's equalizer in the 121st minute that sent the second leg to penalties, and it is the Bosnia and Herzegovina international who may provide key to Inter's hopes of causing an upset this year. She also is a huge threat at set pieces, in part due to her 5-foot-11 frame and impressive aerial instincts.
Juventus: Alba Redondo, FW
Juve have a new spine this season after bidding farewell to veteran stars like striker Cristiana Girelli and midfielder Barbara Bonansea. In their place, there is now the trio of Annamaria Serturini, Remina Chiba and Redondo. The challenge for them will be to add a more potent element to the team after a season that didn't see a single Juve player score five goals or more in the Italian top flight.
Former Real Madrid striker Redondo could be part of the solution to Juventus' problems. The Spaniard is great at making runs into the channels and off the shoulder of the last defender and, despite her inconsistencies in front of goal last season, her movement and acceleration allows her to repeatedly get into the box with the ball at her feet. The 30-year-old is a team player and can play off her teammates across the front line.
Juventus were blessed with a favourable draw, but will Redondo score the goals to capitalise on that?
BK Häcken: Anna Anvegard, FW
BK Häcken arrive at the tournament as European champions after winning the inaugural UEFA Women's Europa Cup under manager Elena Sadiku. However, the Swedish side has lost some firepower in attack with the duo of Felicia Schröder and Monica Jusu Bah leaving this summer.
Those exits mean Sweden international Anvegard has become of increased importance. The 29-year-old has the license to play in a free role behind the striker and does a brilliant job at serving as an outlet and linking up play across the pitch. The former Everton forward is still a threat in front of goal despite the deeper role, as she can create and score equally well thanks to her spatial awareness and movement.
HB Køge: Mille Gejl, CM
Danish champions HB Køge make their return to the UWCL, after they beat PSV Eindhoven in the final round of qualifiers, and are led by the experienced Nadia Nadim in attack. But captain Gejl is the one who makes the team tick.
Gejl is a well-rounded, athletic midfielder who is great at providing support in and out of possession. The 26-year-old can influence the game from open play and set pieces alike. The former North Carolina Courage midfielder has a tall frame that allows her to cover large areas well and excellent technique on the ball, allowing her to link play while also being required to claw back possession and recover from precarious situations.
Servette: Magdalena Sobal, FW
This will be the fifth appearance for Servette in the UWCL after they made it through the qualifiers for the third time. They did so by scoring 12 goals in four qualifying games, including a 3-0 win over Sparta Praha. In three of those games, Poland striker Sobal found herself on the scoresheet.
The 21-year-old, who is on loan from Juventus, has scored 15 goals in her last 13 games, and enjoyed a seven-game scoring streak in the process. While Servette have issues in defense and midfield, their attacks are targeted towards the Poland international, and they will rely on her for goals.
Benfica: Nycole Raysla, FW
There are corners of the women's soccer community that believe Benfica could be the surprise package in Europe this campaign. The Portuguese champions have been handed a relatively favorable draw, and seem a safe bet to improve on last year's performance, which saw them score just four goals and fail to record a single victory.
Their 26-year-old Brazilian striker Raysla is key to their hopes, as she is good at linking play and combining with her teammates. A powerful and physical forward, she also is good at working the channels and being an outlet for her side.
OH Leuven: Lowiese Seynhaeve, GK
OH Leuven turned some heads in their debut campaign last season when they qualified for the knockout rounds ahead of established teams like PSG and Roma. The Belgian club managed to frustrate the talented attacks of PSG, Roma, Paris FC, and even Barcelona to some extent.
Their goalkeeper Seynhaeve was the major reason behind these results. The 26-year-old is a brilliant shot stopper and boasts some jaw-dropping reflexes at close range; she led the UWCL for saves (51) and saves inside the box (41).
This season, she has already played a key role in OH Leuven securing back-to-back qualification by saving two penalties against Fenerbahce in the qualifiers.
Austria Wien: Uka Modesta, FW
Austria Wien won their first ÖFB Frauen Bundesliga title last season and secured qualification to the league phase of the UWCL with a win over Brann in the qualifiers. While the team has some experienced names like Carina Wenninger and Verena Hanshaw, it is 27-year-old Modesta who could be their best hope to change a game.
Modesta's quality on the ball could be a lifeline for Austria Wien, but also keep your eyes peeled for Wien's diminutive 17-year-old midfielder Valentina Pötzl. She is coming off an ACL injury that prematurely ended what was becoming a breakout season for her in the Austrian top flight last season, but she looks to have recovered well.