Mark Viduka was non-committal over his future with the Australia team after his nation's exit at the hands of Japan in Saturday's Asian Cup quarter-finals.
Viduka joined Newcastle from Middlesbrough in June
The Newcastle striker was set to retire from international football before the tournament but then changed his mind.
When asked if he had played his last game for Australia, the 31-year-old said: "I still do not know.
"I have had a great tour, it was good to be involved with the boys. I was happy to be involved in the Asian Cup."
Viduka joined Newcastle in June after rejecting a new contract with Middlesbrough.
Middlesbrough goalkeeper Mark Schwarzer, 34, has indicated he wants to play on with the Socceroos until the next World Cup, while there has been speculation about the international future of striker John Aloisi, 31.
Aloisi scored in the 1-1 draw with Japan before his side lost 4-3 on penalties.
Meanwhile, Australia are conducting an international search to find a new coach to replace Graham Arnold following the Asian Cup exit.
Arnold was given the job on a temporary basis but Football Federation Australia want a bigger name to guide the nation through the 2010 World Cup qualifying campaign.
However, Arnold will remain in charge of the Australia Under-23s team.