The regular season may be done and dusted, but for some of the world's top footballers, there is no time to rest with the Club World Cup kicking off in the United States over the weekend. The global tournament has undergone a major change for 2025, with more teams than ever before now taking part, including two Premier League sides. It will see some of the game's biggest stars - including Lionel Messi, Erling Haaland and Kylian Mbappe - take on teams they have never faced before, with some semi-professional players involved too. But who else is in the mix, what are they playing for and how does it all work? Here's everything you need to know. The Club World Cup is nothing new, having first been contested in 2000 as the FIFA Club World Championship. After a hiatus, the tournament has been held every year since 2005, with Manchester United, Liverpool, Chelsea and Manchester City among the winners in that time. However, this year, the competition has undergone a huge format change, and will be now held every four years rather than on an annual basis. The number of teams involved has also expanded massively, with 32 now taking part in the competition, which was previously only contested by seven sides. The new-look tournament, which is being held at stadiums across the United States, will last for a month and see the top club sides from 20 different countries around the world battle it out for glory. With 63 matches being held across 29 days, the teams have been split into eight groups of four and will face each other in a round robin format in a bid to make it through to the knockout rounds. A staggering £775m prize pot will be split between the 32 teams, with the tournament winners earning up to £97m. Group stage wins are worth £1.5 million each, while the winner of the final on July 13 bank £30 million for that result alone. The tournament will involve teams from 20 different countries and across each of the six international football confederations - Asia (AFC), Africa (CAF), North and Central America (CONCACAF), South America (CONMEBOL), Oceania (OFC) and Europe (UEFA). In most cases, it is the winners of each confederations' equivalent to UEFA's Champions League over the four seasons between 2020/21 and 2023/24 that have qualified, with OFC's representatives the best performing winner accoss the four year period. The most represented confederation at the tournament is UEFA, with 12 European teams taking part. One spot in the tournament is also reserved for a team from the host nation, with Lionel Messi's Inter Miami being awarded that place by FIFA after winning the 2024 MLS Supporters' Shield for having the best regular-season record. The full list of teams involved is below: Group A : Palmeiras, FC Porto, Al Ahly, Inter Miami Group B: Paris St-Germain, Atletico Madrid, Botafogo, Seattle Sounders Group C : Bayern Munich, Auckland City, Boca Juniors, Benfica Group D : Flamengo, Esperance Sportive de Tunisie, Chelsea, Los Angeles FC Group E : River Plate, Urawa Red Diamonds, Monterrey, Inter Milan Group F : Fluminense, Borussia Dortmund, Ulsan, Mamelodi Sundowns Group G : Manchester City, Wydad, Al Ain, Juventus Group H : Real Madrid, Al Hilal, Pachuca, Salzburg After blowing away the competition on the way to lifting the Premier League title last season, many would expect Liverpool to be involved in a tournament celebrating the world's best club sides. However, with only two clubs from each national association allowed, Manchester City and Chelsea are England’s representatives in the United States this summer. This is due to the main qualifying criteria for European sides being their success in the Champions League, with the last four winners before this year automatically invited. Having won the tournament in 2021 and 2023 respectively, Chelsea and City have got the nod at the expense of the likes of Liverpool, Arsenal and Manchester United. All of the games at the Club World Cup are being streamed live on DAZN, which is free to sign up for. In the UK, some matches are also being shown live on Channel 5, but this only covers 23 of the 63 fixtures being played. The games being shown on Channel 5 include Chelsea's meetings with LAFC and Tunis, as well as Manchester City's clashes with Wydad and Al Ain and Real Madrid's matches with Al Hilal and Botafogo. The broadcaster will also show live coverage of four Round of 16 matches as well as two quarter-finals, a semi-final and the final.