Thai Football System Explained

Football leagues around the world have different ways of determining their champions, with promotion, relegation and cup competitions all adding to the complexity. Thailand is no different. Here is how the Thai football system works for the 2026-27 season, along with a look at the cup competitions and some of the amateur football played in the Land of Smiles.

Thai League 1

Thai League 1 consists of 16 clubs. The 3 teams at the bottom of the table are relegated to Thai League 2. Each team in the competition can register up to 45 players, 10 of whom may be foreign. Only 7 foreign players are allowed on the pitch at any one time.

Thai League 1 Action at BG Stadium

Thai League 2

There are 18 teams in Thailand’s second-tier league. The top 2 sides are promoted automatically at the end of the season. The next 4 teams play off in 2-legged semi-finals and a final to determine the third promoted side. The 3 clubs at the bottom of the table are relegated to Thai League 3, with the zone depending on their location.

Thai League 3

The third tier is where things get complicated. The league is split into 6 regional zones, as opposed to Thai League 1 and 2, which are competed for across the country. The zones are North, Northeast, East, Central, West, and South. 

The top 2 in each zone make the playoffs, which are split geographically into 3 groups. The winners of each group plus the next-best points record go into the semi-finals over 2 legs. The 2 winners are promoted and play for the overall title. The losing semi-finalists play over 2 legs, with the winners going up.

The 6 teams that finish at the bottom of each zone are relegated. Some decide to call it a day, while others try to regain their status via the Semi-Pro League.

BYD sponsor all 3 national leagues in the 2026-27 season.

Thai Football Fever at the Sisaket Derby

Thai Semi-Pro League

The Thai Semi-Pro League replaced the Thailand Amateur League as the route for clubs seeking promotion to the professional setup. Again, it is split into six regional zones. However, clubs must meet a set of criteria, which can mean some zones have more teams than others. The six champions are all promoted. Sometimes runners-up also go up.

Amateur Football

The Bangkok Premier League was the foremost amateur competition for several years, until it was overtaken by the Thonburi League, which also serves the capital. In Nakhon Ratchasima, the Korat Super League continues to increase its reputation, while a similar competition in Udon Thani also looks to grow.

Some clubs in Thai League 3 and the Semi-Pro League enter sides into the amateur competitions for player development, and to allow those needing game time to do so.
Amateur football continues to thrive around Thailand. Irregular competitions over 1 or 2 days see sides pay an entry fee to play for prize money, often in 7-a-side events.

Thonburi League action at Old Blood FC in Bangkok

Underage Football

The Thai Under-21 League, sponsored by PEA, has more teams than last season. The Coca-Cola Cup for Under-17 teams saw a huge number of entries split into regional zones before the national knockouts. The competing teams include established clubs, academies, and schools.

The same age group have a similar format in 7-a-side football for schools, with the final round being played over a week on the 7 TV Channel at Bangkok’s Suphachasalai Stadium. Last year's finals made national headlines, with 35,000 spectators attending. 

There are many academies for youngsters around Thailand. Some provide coaching, while others have connections with professional clubs, providing a potential pathway for the most talented.

My Video Preview of the 2026-27 Season

Also Explains How the Thai Football System Works

Thai FA Cup

The foremost competition is the FA Cup, sponsored by Chang. It has a similar format to the English FA Cup, with no replays. Games are settled with extra time if level after 90 minutes, and then penalties. The semi-finals and the final are played on neutral grounds. 

Clubs don't need to enter, with the competition being supplemented by Semi-Pro League and amateur outfits. For some of them, it’s their only competitive football all year.

Thai League Cup

The competition follows the same format as the FA Cup and is currently the Muang Thai Cup to acknowledge its sponsor, Muang Thai Life Insurance. Clubs from all three Thai League divisions can enter, with Thai League 3 clubs starting in the qualifying rounds. Unlike the FA Cup, Semi-Pro League and amateur clubs cannot enter the League Cup.

Teams line up for the 2017 League Cup Final

Thai League 3 Cup

As the name suggests, the sponsored BGC Muang Thai Insurance Cup is a competition for clubs in Thai League 3, with the winners receiving a significant cash reward.

AFC Competitions

AFC Competitions, under the auspices of the Asian Football Confederation, see the most successful clubs compete against the best club sides from across the continent.

For the 2026-27 season, Thailand has three places in the AFC Champions League Elite and one in the AFC Champions League Two. The domestic qualification places are determined by the Thai League 1 finishing positions and the FA Cup, with places moving down the league table when a club qualifies through more than one route.

The next highest eligible Thai League 1 finisher after the ACL Elite places are allocated competes in the Champions League Two.

AFC Football at BG Stadium

ASEAN Club Championship

The ASEAN Club Championship, commonly known as the Shopee Cup, brings together leading clubs from Southeast Asia. Thailand has three places, with qualification determined by the competition's allocation rules and domestic performance.

For Further Reading

If you want to find out about the league and competition winners in 2025-26, my article “Thai Football 2026/27: What to Expect from the New Season” provides a review, as does the video embedded in it.