A lot of details about FC 26 have recently been revealed, with the release date being announced, gameplay improvements and changes being disclosed, and the reveal trailer premiering.
Fortunately, all the FC 26 leagues and licenses were also revealed, and as expected, the top five leagues are all returning, and a few brand-new stadiums have been added.
All Leagues in FC 26

FC 26 has more than 35 leagues, including the Bundesliga, Premier League, Serie A, Ligue 1 McDonald's, and LALIGA EA SPORTS. The best women's leagues in the world are also in FC 26.
Prestigious club international competitions such as UEFA Champions League, UEFA Europa League, UEFA Europa Conference League, and CONMEBOL Libertadores are also in the game and fully licensed.
Most of the leagues in the game have unique broadcast packages, matchday branding, fantastic stadium atmosphere, licensed kits, stadiums, logos, and, of course, authentic squads.
FC 26 has over 20k licensed players and 120 authentic stadiums, including the returning Allianz Arena, and the home of the reigning Champions League champions, the Parc des Princes.
Here are all the leagues in FC 26 revealed by EA so far:
New Leagues in FC 26

While EA hasn't officialized them yet, according to reliable leaks, the Brasileirão Serie A, Liga MX, and the Campeonato Itau are coming in FC 26, making a highly requested return to the EA FC franchise.
As you can see further above, while EA revealed most of the leagues coming in FC 26, it didn't announce all of them. So, it's very likely that the addition of these three leagues to the game will be announced soon.
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