Former Socceroos coach Pim Verbeek has resigned as Oman boss and will retire after a managerial career of almost 40 years.
The 62-year-old took charge of the Oman national team in 2016 and guided them to a Gulf Cup triumph the following year and to the last 16 of last month's Asian Cup for the first time.
Oman FA chief Salem bin Saeed Al Wahaibi called an emergency board meeting on Wednesday and accepted Verbeek's resignation even though his contract ran until next June.
Verbeek began his coaching career in 1981, managing a number of clubs including Dutch giants Feyenoord. He will be replaced by assistant Muhanna bin Said Al-Adawi on an interim basis as Oman begin their search for a new coach.
The Dutchman had spoken optimistically about the future of football in Oman after they were beaten 2-0 by regional heavyweights Iran to exit the Asian Cup.
"We had a fantastic tournament and we should not be ashamed that we lost to a team such as Iran," he said.
"The team has a future as, even though we are a small country, we have talent."
Verbeek was an assistant to another former Socceroo coach Guus Hiddink when South Korea reached the 2002 World Cup semi-finals and worked under Dick Advocaat with the Taeguk Warriors at the 2006 finals.
His three years as Socceroos coach ended after the 2010 World Cup finals, where Australia went out at the group stage after losing 4-0 to Germany in their opening match.