Cahill's decorated green-and-gold career appears over after the country's all-time top goalscorer tapped his wrist knowingly towards family members following Australia's FIFA World Cup-ending 2-0 loss to Peru.

The 38-year-old is yet to confirm this is it, having refused to comment after finally getting some minutes from coach Bert van Marwijk to ensure he played at his fourth consecutive World Cup.

But as the post-mortem begins on the Socceroos' latest failure to progress past their group in Russia, Cahill's time could be at an end.

Bosnich said the greatest servant of the game in Australia deserved to be sent out the right way.

"I think he deserves a massive farewell game," Bosnich told Fox Sports.

"Out of respect it will be down to him - he may say he wants to continue.

"Mile Jedinak and Mark Milligan are a little bit different, I think they can probably go on for a little bit longer.

"That'll be down to Graham Arnold, he may want their experience for that little bit.

"But we're looking forward to the next World Cup in Qatar so realistically he's got to keep that in the back (of his mind)."

Should Cahill hang up his boots and Football Federation Australia agree to a farewell friendly, the earliest that could occur is the next FIFA window in September.

Former A-League coach and Sydney FC assistant Phil Moss did not rule out Cahill pushing on to January's Asian Cup but said his well-documented lack of club game time for Millwall must be rectified.

"Timmy has earned the right beyond any shadow of a doubt to call time when he's ready," Moss said.

"But obviously he's 38 years of age, the next World Cup is four years away.

"The only glimmer of hope is that the Asian Cup is not too far away in the new year, but certainly he needs to be playing.

"At his age you can't just keep training without playing, you need to play games.

"But you would think at 38 this might be the final curtain."