The 1999 Thai Premier League consisted of 12 teams. The bottom club would be relegated to the Thailand Division 1 League. The club that came 11th would play in a relegation / promotion match against the club that came second in the Thailand Division 1 League
Defending Champions Sinthana would enter the next edition of the Asian Club Championship.
The league was also known as the Caltex Premier League.
In the last league fixture, Royal Thai Air Force defeated Bangkok Bank of Commerce 10-0 in a match that was widely believed to be fixed, since the result saw Royal Thai Air Force win the league title by a single goal differential.
An investigation led by the Football Association of Thailand saw the Bangkok Bank of Commerce club manager and an assistant be suspended for one year and six months reapectively, while the Bangkok Bank of Commerce club - who also had outstanding debts to the Thai FA - was expelled from the league and shut down.
There was no punishment to Royal Thai Air Force or its personnel, who were found to have no involvement in, or knowledge of, the match-fixing scheme.
The club that came 11th would play in a relegation / promotion match against the runner-up in the Thailand Division 1 League
â Royal Thai Army relegated to the Thailand Division 1 League and Royal Thai Navy promoted to the Thai Premier League in next season.
The 27th edition of the Queen's Cup was won by guest side Hanyang University of South Korea. This would be their 7th and final victory in the competition.
Bangkok Bank won and retained the trophy for the second year running, by defeating Osotsapa 2âÂÂ1. This was Bangkok Bank's 4th victory in the competition.
The league champion was Royal Thai Air Force. It was the team's second title.