The Football Association of Thailand has urged fans to behave during matches or the country could face harsh sanctions.
The plea was made yesterday after the FAT revealed that it was fined US$30,000 (approximately one million baht) for last month's flare-throwing incident at Bangkok's Rajamangala National Stadium during an AFF Suzuki Cup match.
Thailand beat Indonesia 2-0 on Dec 17 in the second leg of the Southeast Asian championship final for a 3-2 aggregate win.
The scenes, which saw thick plumes of pink smoke blanket crowds at the venue, marred Thailand's record fifth Suzuki Cup triumph.
In a statement issued yesterday, the FAT said it had agreed to pay the fine handed out by the Asian Football Confederation.
In a letter to the FAT, the AFC also stated that "the fine shall be settled within 30 days from the date that this decision is communicated."
The continental governing body added: "The Football Association of Thailand is informed that a repeat violation of this provision will be met with more severe punishment."
FAT spokesman Pathit Supapong said Thailand had been warned it would face harsher sanctions if fans light flares again at a match.
"The penalty will be higher than just a fine," he said.
"To avoid further sanctions, the FAT would like to ask for co-operation from fans to act according to the rules and refrain from doing anything that is against the regulations to avoid harsh sanctions from the AFC."
Following the incident, police issued arrest warrants for 11 suspects believed to be members of the Ultras Thailand group but have since failed to nab one.
Football authorities are trying to curb the rising use of flares, fireworks and smoke bombs inside stadiums around the world by abandoning matches, fining teams and deducting points.
Last month, league matches in both Belgium and France were called off after fans fired fireworks and flares at each other.
In November, Fifa launched disciplinary proceedings after Poland striker Robert Lewandowski was felled by a firework fired from the stands during a World Cup qualifying game against Romania.
In 2015, Fifa fined Malaysia and ordered them to play a game behind closed doors after flare-throwing fans forced the abandonment of a World Cup qualifier against Saudi Arabia.
SCG, Kirins strike new deal
Thai Premier League champions Muang Thong United have signed a new five-year, 600-million-baht sponsorship contract with SCG, the two parties announced yesterday.
SCG has begun sponsoring the Kirins five years ago.
Muang Thong chairman Pongsak Pol-anan said: "With support from SCG, we have set a higher target. We aim to become successful in every tournament we compete in. We believe we can move our Asian standing over the next three to five years under the theme 'Be the Future'."
SCG executive Yuttana Jiamtrakarn said: "We have been supporting Muang Thong United because we see sports an important thing for health. We also want to see Thai athletes move up to the world level. Apart from football, we also support badminton and golf."