Both head coach Bryan Robson and assistant Steve Darby have left their posts with Thailand national team "by mutual consent" according to the Thai FA president.
Robson, a former England international, underwent surgery for throat cancer in March after replacing compatriot Peter Reid in September 2009. His former club Manchester United, though, stated on their official website that Robson's recent cancer scare was not behind his decision to leave the Thailand post.
"Bryan wished to resign and his contract was terminated by mutual consent, but I cannot give any more details," Football Association of Thailand President Worawi Makudi told Reuters.
Thailand dropped 15 places to 120th in the FIFA rankings under Robson's management and won just seven of 18 matches.
Robson remains an official ambassador at Old Trafford and will continue in that role.