For two decades, it was the most familiar structure in European club football. Thirty-two teams. Eight groups of four. Home and away. Top two go through. Third into the Europa League. Fourth go home. That was the UEFA Champions League group stage from 2003 onwards — consistent, predictable, beloved by some, quietly criticised by others.
Then, from the 2024–25 season, it all changed. The UEFA Champions League underwent the most significant structural overhaul since 2003, moving away from the traditional group stage to a new, expanded league phase featuring 36 teams. The format has been retained and refined for the 2025–26 season. Here's everything you need to know.
The League Phase: Goodbye Groups, Hello Swiss Model
The most fundamental change is the replacement of the traditional group stage with what UEFA calls the "league phase" — sometimes referred to as the "Swiss model," a term borrowed from chess tournament structures. Those 36 clubs participate in a single league competition in which all competing clubs are ranked together. Teams play eight matches against eight different opponents — four at home, four away. This replaces the old format of six group matches against just three opponents.
To determine the eight different opponents, the teams are initially ranked in four seeding pots based on UEFA club coefficients. A club cannot play a team from its own domestic league during the league phase. The Champions League league phase runs from September through to late January, with all 18 matches on the final matchday played simultaneously.
How Teams Progress — Three Tiers of Outcome
The new format creates three distinct groups of teams based on their final league phase position:
- Top 8: Advance directly to the Round of 16 — no play-offs required.
- 9th–24th: Enter a two-legged knockout play-off round in February to earn a Round of 16 place.
- 25th–36th: Eliminated from European competition entirely — no drop into the Europa League.
That last point is significant. Under the old system, Champions League group-stage teams finishing third dropped into the Europa League knockout rounds. Now, finishing outside the top 24 means your European campaign is over. This sharpens the stakes of every league phase matchday and maintains the Champions League's exclusivity.
In the knockout play-offs, clubs finishing 9th–16th are seeded against unseeded clubs placed 17th–24th. The seeding system continues into the Round of 16, where the top eight from the league phase are seeded and play the winners of the play-off round.
A Key 2025–26 Change: Home Advantage Based on Merit
One of the most interesting adjustments introduced specifically for the 2025–26 season concerns who hosts the second leg in knockout ties. Teams who finished in the top four of the league phase are guaranteed to host the second leg of their Round of 16 and quarterfinal ties. Teams who finish first and second in the league phase are also guaranteed home advantage for the semi-finals — should they make it that far.
Teams can "win" home advantage during the knockout stage by defeating sides who finished in the league phase's top four. This change came after a widely perceived imbalance in the inaugural 2024–25 season, when high-finishing teams were disadvantaged in the draw. The new rule rewards league phase performance with concrete competitive advantages in the knockouts — a sensible and fan-approved evolution.
Qualification: How Teams Get Into the Tournament
The new access list is more complex than the old one, but follows a clear logic. Twenty-five of the 36 teams automatically qualify for the Champions League through their domestic league finishes. Member associations ranked first to fourth as per the UEFA coefficient — England, Spain, Germany and Italy — have four spots each.
Two additional places are awarded as European Performance Spots — going to the associations with the best collective club performance in European competition the previous season. Those two associations each earn one automatic league phase place for the club ranked next-best in their domestic league behind those already qualified directly. In the inaugural 2024–25 season, Italy and Germany claimed these spots, with Bologna and Borussia Dortmund benefiting as a result.
For the 2025–26 competition, England and Spain claimed the European Performance Spots. The remaining seven places are filled through qualifying rounds — the long road that domestic champions and clubs from smaller associations must navigate to reach the main competition. The winners of the previous season's Champions League and Europa League are also guaranteed league phase places.
Prize Money: The Financial Stakes
The financial stakes have grown substantially under the new format. For the 2025–26 Champions League, the total prize money pool is $2.9 billion, divided into equal shares, performance-based rewards, and a value pillar based on market size and broadcasting reach. Teams reaching the league phase receive an automatic $21.7 million. A win in the league phase earns a further $2.5 million. Winning the final is worth $29.2 million. The eventual winner, if winning every game, could earn approximately $129 million — an extraordinary sum that underlines why Champions League qualification is a financial necessity for ambitious mid-sized clubs.
The 2025–26 Season in Summary
The 2025–26 Champions League final was played on 30 May 2026 at the Puskás Aréna in Budapest, Hungary. Paris Saint-Germain claimed the trophy — their first Champions League title — and automatically qualified for the 2026–27 UEFA Champions League league phase, the 2026 FIFA Intercontinental Cup, and the 2029 FIFA Club World Cup group stage. PSG will face Aston Villa — winners of the 2025–26 UEFA Europa League — in the 2026 UEFA Super Cup.
The 2025–26 season was also the first Champions League to feature six clubs from one nation — England — with the sixth spot earned through UEFA coefficient ranking plus Tottenham Hotspur having won the previous season's Europa League.
Has the New Format Delivered?
The verdict, broadly, is positive. The inaugural 2024–25 season produced exactly the kind of drama UEFA hoped for — marquee matchups between top-seeded teams that would never have appeared in the same group under the old format, thrilling late-season surges for the top eight places, and genuine jeopardy for major clubs who underperformed.
Critics would note that 36 teams across eight matchdays adds to already demanding fixture schedules for top clubs. Player welfare advocates have raised concerns about match volume. There is also a view that the new format disproportionately benefits the very largest clubs, who now have even more guaranteed marquee fixtures and revenue, while mid-table European nations' clubs still struggle to survive the league phase against elite opposition.
These are legitimate refinements to debate. But the old group stage had grown predictable — often mathematically irrelevant by the third or fourth matchday for the strongest and weakest teams alike. The new league phase keeps every team engaged across eight games, the expanded field gives more of Europe's footballing nations a genuine stake, and with PSG lifting the trophy in Budapest, the competition retained its habit of producing the grandest occasion.
European football continues to evolve. The Champions League, as it enters the 2026–27 season, remains exactly what it was always meant to be: the ultimate stage for the world's greatest clubs. Just with a more compelling set of rules — and more intrigue than ever.