There are 16 clubs in the league, with three promoted teams from
Thai League 2 replacing the two teams that were relegated from the
2019 season along with
PTT Rayong who folded at the end of the campaign. All clubs that secured Thai League status for the season were subject to approval by the AFC Club Licensing before becoming eligible to participate.
Chainat Hornbill and
Chiangmai were relegated at the end of the 2019 season after finishing in the bottom two places of the table.
PTT Rayong withdrew from the league after the season, sparing
Suphanburi from relegation. They were replaced by
2019 Thai League 2 champions
BG Pathum United, whom played under the name Bangkok Glass in the
2018 Thai League 1 campaign. They were joined by runners up
Police Tero, who also got promoted at the first time of asking and 3rd place
Rayong.
Rayong was founded in 2009 and earned promotion to the
Thai League 1 for the first time in their history.
Stadium and locations :
Note: Table lists in alphabetical order. Personnel and sponsoring Note: Flags indicate national team as has been defined under
FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
Managerial changes ==Foreign players==