The Football Association of Thailand (FAT) has sent a notice to Kiatisak Senamuang to renew his national team coaching contract as per terms and conditions spelled out by the FAT by Tuesday or lose his job.
The notification was sent on Sunday by FAT lawyers to a company owned by Kiatisak.
The coach was handed a draft contract earlier this month to which he sought some amendments, which have apparently been turned down by the FAT.
"You are requested to agree to the terms and conditions for the contract which have been laid down by the association within the stipulated time-frame," the FAT lawyers advised Kiatisak through the notification.
Kiatisak, who guided Thailand to their second straight Suzuki Cup title in December, has to renew his contract with the association by the end of this month.
The coach has also been informed that his failure to respond within the given time "will be deemed as a refusal on your part to renew the contract and the FAT will have the right to discontinue the negotiations in this instance".
FAT president Pol Gen Somyot Poompunmuang, who has the authority to sign the contract, is due to attend a Fifa meeting in London early next month.
Thailand are scheduled to play their next two Group B matches of their World Cup bid against Asian football powerhouses Saudi Arabia on March 23 and Japan on March 28.
Thai league results
Newcomers Ubon UMT United won their third straight Thai League 1 match when they edged struggling Suphanburi 2-1 last night.
Ubon were reduced to 10 men but only after Nebihi Bajram and Kenta Yomazaki had put them 2-0 ahead by the 70th minute. Guilherme Dellatorre grabbed the only goal for Suphanburi eight minutes from time.
Navy picked up their first win of the new season, edging Thai Honda 1-0 last night when Rodrigo Vergilio scored a 72nd-minute penalty.
On Saturday night, defending champions SCG Muang Thong United claimed three important points by edging Police Tero 1-0 with Adisak Kraisorn delivering the winner.
Kirins coach Totchtawan Sripan attributed the victory to luck, saying: "They knew our tactics. We couldn't attack as much as we wanted to because we rested some key players. In the end, we got lucky."
At Thammasat Stadium, former Thailand striker Teerathep Winothai scored four goals as Bangkok United defeated Port 6-2 in the other late match on Saturday night.